Polyisoprene is a natural ingredient also known as 'Natural Rubber'. Rubber is obtained from trees through tree taps. PolyIsoPrene is a common polymer that is used in Polycraft World in a variety of settings. It can be found in different forms: pellets, fibers, blocks, stairs, walls, slabs and double slabs. Within the pellets, PolyIsoPrene comes in three different sizes: bags, sacks and powder kegs.
A stack of pellet bags crafts into a sack, and a stack of sacks crafts into a keg.