X101: high-performance, chamfered, anti-drop, lightweight, Singlespeed chain for Mountain, BMX, Fixie, Track applications- S10: stainless steel construction great for electric bikes, internal gear hubs, and beach cruisers- K1 Wide (formerly Z-710): specially shaped, extra-thick outer plates and bulls-eye riveting for frequent grinding- S1 (formerly Z-410): bushing-less design for normal BMX and Singlespeed use- B1H: nickel plated chain has heavy duty structure with bushing construction- Z1eHX: heavy duty chain has gone through a stretch proof treatment and features mushroom riveting along with an anti-drop design