The core cap increases the friction, you can easily pull the core with one hand and adjust the screw with the other hand.What the cap can offer is that it can prevent the bifurcation at the end of the core.Made of aluminum alloy material, the cap is durable.The length of single product is 1cm, the width is 0.5cm, the tickness is 0.5cm.It is suitable for road bikes and mountain bikes.Item Name: Bicycle Cord CapMaterial: Aluminum AlloySize Details: 1cm x 0.5cm x 0.5cm/0.39" x 0.20" x 0.20" (Approx.)Notes:Due to the light and screen setting difference, the product's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement. How to use: Put the core cap on the end of the core and gently clamp it with a wire cutter.Package Includes:100 x Bicycle Cord Caps