New super duty 1/8" chain features bushingless construction, thicker side plates, specially heat treated Bull's-Eye Riveting Pins and our new StretchProof material combination. The bushingless construction reduces weight, allows for a smaller sleeker chain profile and smoother, quieter operation. The distinctive Bull's-Eye Riveting Pin provides the highest level of Pin Power and tensile strength. Our StretchProof format combines premium plate materials and superior heat treatment for unsurpassed durability. The Z510HX is targeted for lighter weight Track bikes, single speed mountain bikes or BMX bikes with 1/8" sprockets.