The Busch Muller Cycle Star 80 Mirror offers a large surface area using the highest quality materials for maximum durability and is certified for speed E-Bikes, mounting easily just inside the handlebar. German Quality and Design Manufactured by the world-renowned Busch and Muller in Germany, the Busch Muller Cycle Star Mirror features an extremely adjustable and foldable shaft, high-quality glass, and a protective back to give you the best rearview visibility and great durability while meeting all of the legal requirements for E-Bikes. Busch Muller Cycle Star Specifications - Special mirror-bar with impact joint - Large 80mm diameter surface area - Soft Protective edges - Shatter protection - Fold-able and extremely adjustable - Easy, sturdy mounting to the handlebar - Available in 2 sizes for internal handlebar diameter: 14.5 - 15.5mm or 17.2 - 22 mm Don't hesitate to contact our E-Bike experts at Scooteretti with any questions regarding the Busch Muller Cycle Star Mirror