This is the rubber you need to make your own hand or pole spear rubbers, it might look like the 10mm bungee Rubber but it is very different.
This rubber is made in the USA from genuine latex rubber is formed using the dipped layer process where the inner layers remain natural and the outer layers are carbon impregnated. This high tech process is designed to extend the life of the natural latex enhancing the physical properties of the rubber and offering up to 1000% elasticity.