Polycord also referred to as urethane or polyurethane cord is the standard material in producing polyurethane belts and O-rings. It can be used to make line shaft O-rings, roller-to-roller O-rings, divert O-rings, and much more. Polycord comes in spools of various diameters. It can be used for heavyweight items. Comes is various colors (blue, red, green) based on maximum weight (88A). To know more you may visit the website.