Prompt delivery you can find all international measures of O-rings in the standard hardness of shore 70 in:

NBR: black color
EPDM: black color
FPM (VITON ®):  brown color
NEOPRENE: black color
FLUOROSILICONE: grey color
LIQUID SILICONE RUBBER LSR: red / transparent color
PTFE: colour white

For the standard O-rings in Liquid Silicone Rubber (LSR) are available on stock in red or transparent color and all with the FDA certification, thanks to the dyestuff plant pigment.

Different colors, hardness or medical grade certificated O-rings are molding on request.