---
product_id: 1288439
title: "StratoFins Screw-on Water Rocket Fins - Compatible with 2 Liter Bottles or Smaller"
brand: "relationshipware"
price: "₩32242"
currency: KRW
in_stock: true
url: https://www.desertcart.kr/products/1288439-stratofins-screw-on-water-rocket-fins-compatible-with-2-liter
store_origin: KR
region: South Korea
---

# Lightweight at 1 oz No tools needed 95% compatibility StratoFins Screw-on Water Rocket Fins - Compatible with 2 Liter Bottles or Smaller

**Brand:** relationshipware
**Price:** ₩32242
**Availability:** ✅ In Stock

## Summary

> 🚀 Take your water rocketry to new heights!

## Quick Answers

- **What is this?** StratoFins Screw-on Water Rocket Fins - Compatible with 2 Liter Bottles or Smaller by relationshipware
- **How much does it cost?** ₩32242 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/1288439-stratofins-screw-on-water-rocket-fins-compatible-with-2-liter)

## Best For

- relationshipware enthusiasts

## Why This Product

- Trusted relationshipware brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **STEM Learning Fun:** Perfect for educational projects and hands-on learning.
- • **Effortless Assembly:** Screw-on design means no tools or glue required.
- • **Compact & Lightweight:** Weighs just 1 ounce for easy transport and setup.
- • **Elevate Your Launches:** Experience higher flights with StratoFins!
- • **Universal Compatibility:** Works with 95% of launchers, homemade or commercial.

## Overview

The StratoFins Screw-on Water Rocket Fins are designed for compatibility with 95% of launchers, making them an ideal choice for both DIY enthusiasts and commercial users. This lightweight, easy-to-assemble kit includes an attachment ring and three fins, perfect for enhancing your water rocket experience while promoting STEM education.

## Description

StratoFins Screw-on Water Rocket Fins - Compatible with 2 Liter Bottles or Smaller

## Features

- Compatible with 95% of all available launchers either homemade or commercially available.
- Works with various styles: cable ties, rubber stopper, expanding tube, nozzle, or O-ring.
- No tools or glue required for assembly, simply screw-on to a 2 liter soda bottle or smaller.
- Take your water rocketry to the next level of higher flights with screw-on StratoFins.
- StratoFins kit includes 1 attachment ring and 3 fins along with an instruction sheet.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Item Weight | 1 Ounces |
| Item Dimensions | 7.5 x 5.5 x 2 inches |
| Material Type | Plastic |
| Color | Red |
| Theme | Rocket |
| Operation Mode | Manual |
| Educational Objective | STEM |
| Power Source | manual winding |
| Number of Players | 1 |

## Images

![StratoFins Screw-on Water Rocket Fins - Compatible with 2 Liter Bottles or Smaller - Image 1](https://images-na.ssl-images-amazon.com/images/G/01/x-locale/common/grey-pixel.gif)

## Questions & Answers

**Q: what is the internal diameter of the red threaded end of the assembly?  Is it the same as the internal diameter of the threaded 2L bottle opening?**
A: This answer is coming from Dallas Murdoch, Owner of EZ-Launch LLC and a dealer for the red fins.  The internal portion of the top half of the red fin assembly is threaded and screws onto the launch bottle.  Its diameter is 29.6 mm.  The internal diameter of the threaded opening on a two liter launch bottle is 21.0 mm.  The internal diameter of the lower 1/2 of the fin assembly is 21.3 mm.  The internal diameter of the pop bottle where the external threads are located is 21.1 mm.  If you are using an EZ-Launch bottle rocket launcher with the red booster fins, you need to have a round white ABS plastic insert glued to the lower threaded portion of the red booster fins.  This comes with the booster fins when ordered from EZ-launch.com and is necessary to lock the bottle with the fins into the EZ-Launch bottle rocket launcher.  Also, The red booster fin assembly requires a separate black launch pipe in order for the bottle to maintain a steady air pressure and hold the water inside of the bottle.  This also is included in the EZ-Launch bottle rocket booster kit that comes from EZ-Launch LLC.

**Q: Why do these required using an additional nose cone?**
A: the additional nose cone improves aerodynamics and is where the parachute is placed for launch

**Q: What type of plastic is this product made with, my son has sensitivities.**
A: The StratoFins are made from polypropylene (PP), which is the same plastic on the white cover of a Tic Tac Mint container that has the "living hinge."

**Q: Like the nose cone idea. Anybody use a mylar parachute?**
A: We have no experience with using mylar for a parachute, but that sounds like an interesting idea. It should be durable and lightweight, which might make a great choice for material. The only issue might be how well it drapes, since it could be somewhat stiff although you could pre-wrinkle it. Plastic trash bag work for parachutes and mylar wouldn't be too much different from that of than draping. We use rip-stop nylon for our parachutes, which is very durable with great longevity. If you are using it on a water rocket, watch the video link if you haven't seen it already. It will help explain attaching it to a 2-liter soda bottle and offer deployment techniques.

## Frequently Bought Together

- StratoFins Screw-on Water Rocket Fins - Compatible with 2 Liter Bottles or Smaller
- Relationshipware StratoChute 24" Red Rip-Stop Nylon Parachute for Water or Model Rocket

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**Shop now:** [https://www.desertcart.kr/products/1288439-stratofins-screw-on-water-rocket-fins-compatible-with-2-liter](https://www.desertcart.kr/products/1288439-stratofins-screw-on-water-rocket-fins-compatible-with-2-liter)

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-01-23*