Unfortunately the market has been saturated with silicone worm material(Squirmy Wormy) and 99% of it is garbage. We have our Squirmy material produced using a higher grade of silicone, which means that it can be stretched to about 5 times its original length without cracking or tearing. Each bag contains enough material for 40 size 12+ flies or 80 size 14-18 flies(about twice the material you get from others). Each bag includes instructions on how to tie the best Squirmy Wormy Fly. Choose from 7 different colors.