Sun gold 3-Inch x24-Inch Portable Belts are made from the best material with a joint that won't break; solving the problem of belts popping. Sun gold Portable Belts are made from the same material we use for our Industrial Wide Belts. Sun gold's Thin Joint Technology has the industry standard for skive joints that are thin and bump free while providing superior strength over traditional tape joints. Sun gold Abrasives have been manufacturing coated abrasive products for over 37 years..