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.
It should be noted that a stack of pellet bags crafts into a sack, and a stack of sacks crafts into a keg.
PolyIsoPrene on en.wikipedia.org
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Polyisoprene pellets are natural ingredients obtained from trees using tree taps.