... are high quality and most competitive in market.Features:Teeth Type: MXL,XL,L,H,XH,XXH,XXL,SL9,SL12,SL ... ,20M AND SO ONMetric System: T-type serie(T2.5,T5,T10,T20)HTD type(3M,5M,8M,14M)STPD/STS types ... is larger than 250 mm, iron is used.The pitch&tooth type of double sided timing belt is same as synchronous belt ...