Recycled Polypropylene (PP #5) Pellets, Natural, 1 kg One kilogram (2.2 pounds) of 100% recycled plastic resin pellets manufactured by Birch Plastics, repackaged for sale in retail quantities for desktop injection machines and home hobbyists, makers, and crafters. This plastic is polypropylene (PP), identified by the #5 recycling symbol. "Natural" pellets are uncolored and are milky/translucent. You can add colorant pellets to get a desired color, or use them to extend the volume of already colored regrind, flakes, or pellets.