Description: Material:silicone rubber Color:black Small ring Length: 6-10cm Large ring length:7.8-14cm Gross weight:10g Specifications: Lightweight and small size Portable to carry Easy to install Perfect for cycling Made of silicone material Durable and compact Package Included: 1 x Large Fastening Bike Light Ring 1 x Small Fastening Bike Light Ring Notes: Due to the difference between different monitors, the pictures may not reflect the actual color of the item. Compare the detail sizes with yours, please allow 1-3cm error, due to manual measurement. Please leaving a message before you give the bad feedback, if the products have some problems. Thanks for your understandings.