At the first grip, they seem a little thin and tend to stick together. After fitting, they seem still very strong. You can reach them in about 6 pines loom without problems, which is more than enough for most design that were found on Youtube. Once stretched, they do not return to their original position but it is not very troublesome.
They are strong and do not break. I think none or very little elastic are broken so I recommend. Do not, however, expect to receive the same quality elastic than rainbow loom however.
