... .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 20~90 ... , etcProvide ServiceRubber injection molding, Rubber transfer molding, Rubber compression molding, Rubber to metal molding, Custom rubber moldingColorYellow, Red, Black, White ...