... 4.Strictly Quality Control 5.Timely Delivery Features:1. Teeth Type: MXL,XL,L,H,XH,XXH,XXL,SL9,SL12,SL ... ,20M AND SO ON2. Metric System: T-type series(T2.5,T5,T10,T20)3. HTD type(3M,5M,8M,14M)4. STPD ... /STS type(S2M,S3M,S4.5M,S5M,S8M,S14M ... available.7. Surface treatment:black oxdizing,phosphating,anodize,zinc-plating Timing belt pulley