Silicone 20 to 85 Shore A
Nitrile 40 to 90 Shore A
EPDM 40 to 90 Shore A
FKM 60 to 90 Shore A
Neoprene 40 to 85 Shore A
Fluorosilicone 50 to 80 Shore A
SBR 50 to 80 Shore A
Urethane 50 to 90 Shore A
X-NBR 50 to 80 Shore A
HNBR 50 to 80 Shore A
Perfluoroelastomer 70 to 90 Shore A
The O-Rings are available in standard metric sizes (cross sections are in 0.5 millimeter and inside diameters are in 1 millimeter increments) and in standard inch sizes.