【Cup Holder Extension】The extendable base can be adjusted from 2.6" to 3.8" in diameter to fit different types of car cup holders. Simply rotate the base of the car cup holder adapter to expand or contract it. The base is designed with non-slip silicone to attach the cup holder securely. Whether it is a small car or a truck, this car cup holder provides stable and reliable support. 【High-quality plastic material】 The main body of the car bottle holder is made of high quality plastic (ABS), lightweight, durable, waterproof and easy to clean. It has been carefully designed to prevent breakage and scratches and ensure long-term use. The high-quality plastic material maintains its stability and durability regardless of high or low temperature. 【Anti-slip silicone strips】To further improve stability, the car cup holder is equipped with anti-slip silicone strips. non-slip silicone. These are located at the entrance to the cup holder and effectively reduce vibrations and shocks while