... , TB, SC,SB... 2.Material: NBR,Silicon,FPM, 3.top-quality and competitive price. rear crankshaft oil seal : 1.Material:NBR,HNBR ... , etc2. types of Rubber Oil Seal: TC, TB, TA, SC, SB, SA, VC, VB, VA, KC, KB, KA, DC, DB etc ... ,aging resistant, weather resistant, good insulation property, anti-toxic, good air-permeable, etc.4.Production Control:prouduced by priecise CNC machine5 ...