Heavy Duty off-road & MX chains 428 RXP Pro-MX Chain 120 link: Non-O-ring chain Designed specifically for high-powered, mini-racing machines High application greased chain High-tensile strength nickel-plated inner link plates High-tensile rust-resistant gold plated side plates Solid rollers Clip-type connecting link included Recommended for applications between 80-125cc Replacement connecting link available 420 RXP Pro-MX Chain 120 link: Non-O-ring chain Designed specifically for mini-racing machines High application greased chain High-tensile strength nickel-plated inner link plates High-tensile rust-resistant gold-plated side plates 428 O-Ring Drive Chain 124 link: Uses O shaped self lubricating seal allowing constant lubrication Extra high-tensile strength link plates Rust-resistant nickel-plated gold colored side plates Gold inner and outer links Solid roller inner link and inner bushing Clip-type connecting link included