The role of the skeleton oil seal is generally to isolate the parts that need lubriC-A-Tion in the transmission parts from the output parts so as not to leak the lubricant. ... The skeleton oil seal is made of high-quality nitrile rubber and steel plate, with stable quality and long service life.Type of Skeleton oil seal: ■ SC : ■ SB; ■ TC ; ■ TB ; ■ TCK ; ■ VC ; ■ VB ; ■ KC ; ■ KB ; ■ TCZ ; ■ TCV ; ■ TCN ; ■ TC4 ; ■ TB4 ; ■ TC ; ■ SA1 ; ■ VA ; ■ KA3J ; ■ DC ; ■ DB ; ■ OC ; ■ QLFY ; ■ SBB ; ■ MG ; ■ WT ; ■WTT ; ■ OKC3 ; ■ MOX ; ■ MOD ; ■ MOY ; ■ BABSL/BAUM5SLX7