Specifications:For general application, probelt assorts four kind of grades for customer's requirement. Firstly grade S 150 the most economic one, is designed for those light duty application, ususally for conveying materials with moderate abrasion and small size. In addition, considering heavy duty application and good resistance to abrasion, ozone, cutting, and gouging, grade s180, s240 are the best option for you to make, but how to correctly choose one of either, please refer to page 7 for full details. In final, sar90 is recommended for applications where severe abrasion is the top concern, like materials with heavy and sharp. Any General details, Please, e-mail to contac with Roger Hsieh.