Used to stop your chain from getting tangled up during transportation and keeps the frame from scratching when cleaning your chain . Feature: Designed to keep the chain tensioned and away from the frame during cleaning, transporting, lubing and storage a bike. Simply remove the rear wheel and fit the chain keeper in the wheel dropout above the rear derailleur. Made of quality plastic material, rust-resistant and corrosion-resistant, sturdy and durable to use. Pocket size and light in weight, convenient for you to take with and repair your bike anytime and anywhere. Suitable for MTB and road bikes, aluminum and carbon frame. Specifications: Material: Aluminum alloy + Plastic + Stainless steel Color: Black Type: Type A / Type B / Type C ( optional ) Packing Size: 16.5 * 8.5 * 1.5 cm / 6.5 * 3.3 * 0.6 in Packing Weight: 24 g (Type A) - 74 g (Type B) - 80 g (Type C) Package List: 1 * Bike Chain Holder 2 * Sponge Rings