... 1.material:made in high grade silicone rubber material,environmental safe material,non-toxic.2 ... Range: -150F to 550F, depending on material ItemDescriptionMaterialNR, NBR, SBR, EPDM, IIR, CR, SILICONE, VITONHardness 20 ... medical, etcProvide ServiceRubber injection molding, Rubber transfer molding, Rubber compression molding, Rubber to metal molding, Custom rubber moldingColorYellow, Red, Black, White, ...