1)dependable price 2)good silicone rubber material 3)density:1.19-1.35 g/cm3 ... kinds of material : NBR,HNBR,EPDM,SILICONE,VITON,NR,FLS,FFPM,PU,PTFE etc.2.Good quality,reasonable price3.Various types,colors ... , anti-aging, no poison and no smell,waterproof,anti-static,good sealing effects,etc7.Package:plastic bags inside,carton boxes outside ...