15/20/25/30mm

A very good buy.

Wish I could get back of just the 2 middle sizes. Perect for making ID lanyards with out a lot of bulk.

To flexible

Merchandise is excellent as expected.

this is an ok product.

Looking at the reviews, I see this is a pretty common problem, though I seem to have had better luck than most. I wanted some black key rings to match some of my bags and pouches. I liked this set because of the number you get and the variety of sizes. What I got was somewhat disappointing. Initially, only a quarter of the rings, most of them the smallest size, were functional. The rest were rendered unusable, fused together by the powder coating. I was able to pry some of them apart with a knife, and ended up with about half of the rings being usable. I may try another, less dangerous, method to pry the rest apart, but it's almost not worth the frustration and risk of cutting myself in the process.

They work well, durable key rings.

I needed these in order to build a better keychain. I found these rings were more robust than some of the factory rings that came with my keychains. With the multiple size options, it was easy to replace them. The rings are firm, but still easy to open and use by hand.Overall, I would recommend due to their value, build quality, and the multiple sizes in this product.