Silicone Ring, Abrasion Resistance Poor, Cell Type Closed Cell, Chemical Resistance Good, Color Red, Compression Set 29 Percent, Density 39 lb/cu ft, Diameter Tolerance +/- 0.01 in, Firmness @ 25 Percent Deflection 11 psi, Flexibility Excellent, Grade Standard, Inside Diameter 1 in, Material Silicone, Material Skin None, Maximum Temperature 500 Degrees F, Minimum Temperature -100 Degrees F, Oil Resistance Good, Outside Diameter 1 1/4 in, Shape Ring, Standards ASTM D1056 2D3