KMC's new super duty 1/8 chain features bushingless construction, thicker side plates, specially heat treated Bull's-Eye Riveting Pins and new StretchProof material combination. Notice the pins. They have a dimple in the middle. AKA Bullseye pins. The pins are stronger, combined with good plates that don't snag, make this a great chain for use on sprockets with guards.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. Stretch Proof format combines premium plate materials and superior heat treatment for unsurpassed durability.