- X9 EPT EcoProTeQ Anti-Rust technology, KMC's X-Bridge for faster and smoother shifts, eXtra stretchproof treatment for longer chain life. * 1/2" X 11/128" - 114 Links, pin length 6,6 mm * Compatible with: any 9-speed derailleur system * Hi-Performance * Extremely durable * EcoProTeQ Anti-Rust technology