The Pro Derailleur Housing, with a Ø4mm specification, is available in 1.8M, 50M, and 100M lengths. Featuring a compressionless high carbon steel linear shell for precise shifting performance, it also includes a double super-durable plastic layer for enhanced weather resistance and durability. The low friction polyethylene liner ensures smooth operation, while the super lightweight design provides added convenience. This housing guarantees exceptional protection for derailleur cables, ensuring reliable shifting and durability for your bike.