The upgraded universal bicycle speaker mount features a bottom design that ensures a more secure hold for your speakers, making it Compatible with for GO 4/GO 3/GO 2 wireless Bluetooth-Compatible speakers. PC Material: Constructed from PC material with anti-slip large particles, the fixed holder prevents bending or deformation Portable and Versatile: The portable road bike bracket speaker rack is not just for bicycles. It's ideal for hiking, boating, workouts, and sunbathing for Environments: Designed to be universally compatible, the portable speaker mount ensures a snug fit and secure hold in a variety of environments Convenient and Easy to Use: The portable speaker mount is easy to install and remove, offering a hassle-free experience for users looking to enjoy their music . Applicable:Compatible with for GO 4/GO 3/GO 2 wireless BT speakers are universal Functional features: The speaker can be fixed on a bicycle or motorcycle for riding. Pipe diameter size on the bicycle: suitable for 25mm (0.98inch)-32mm (1.26inch) Size about: 100mmx85mmx82mm (3.94inchx3.35inchx3.23inch) Color:Black Material:ABS+PC Package Contents: 1 Set x Universal Bicycle Speaker Mount Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.