High-quality rubber blocks comes for your guitar and guitar strap and just suits nicely. They can help you to fasten strap with the guitar while protect the joint from being scratched. Features: Guitar strap blocks is specially designed for guitar and ones who loves music. Made of rubber the blocks features ideal friction force for fixing the strap and the guitar. With modern processing technique the blocks are well-made with standard. High compatibility for strap buttons and easy to install without replacing existing buttons. Four stylish colors for option. Different color for different style and different attitude towards life. Specifications: Brand: IVU Creator Material: Rubber Color: Red & Blue / Black & Gray (Optional) Package Size: 8 * 8.5 * 2cm / 3.1 * 3.3 * 0.8in Package Weight: 10g / 0.4oz (4pcs) Note: Only the rubber blocks are included. Two red and two blue for a set. Two black and two gray for another set. Package List: 4 * Strap Lock