... rollerThey are classified in natural rubber (NR), nitrile butadiene rubber (NBR), chloroprene rubber (CR), ethylene-propylene-diene monomer (EPDM), silicon gel ... ).They are classified in natural rubber (NR), nitrile butadiene rubber (NBR), chloroprene rubber (CR), ethylene-propylene-diene monomer (EPDM), silicon gel ...