... tests passed. Belt kits. We produce HNBR synchronous belts, CR & HTN synchronous belts.Our belts have passed all the test items by AKRON ... LAB in USA.Also, we make different grades of V belts & PK belts.Besides belts, we manufacture big ranges of precision tensioners, pulleys, gears ... , Korea, Japan, US,Colombia, Venezuela, etc.TS Certificates are approved. V belts