Features： 1、The surface is made of good quality PU, waterproof, durable, wear-resistant and easy to clean. With thick foam inside, ergonomic design, high elastic and comfortable to use. 2、Adopts stainless steel rack, high strength, wear-resistant and long life time. 3、This back rest is suitable for most of bikes, electric bikes and other bikes, convenient and safe. 4、Wider than the typical seat your bike have, this backseat supports the waist area and helps reduce fatigue. 5、Easy to install and remove. An ideal replacement for riding. Specification： Features: The surface is made of good quality PU, waterproof, durable, wear-resistant and easy to clean. With thick foam inside, ergonomic design, high elastic and comfortable to use. Adopts stainless steel rack, high strength, wear-resistant and long life time. This back rest is suitable for most of bikes, electric bikes and other bikes, convenient and safe. Wider than the typical seat your bike have, this backseat supports the waist area and helps reduce fatigue. Easy to install and remove. An ideal replacement for riding. Specification: Item Type: Electric Bicycle Backrest  Material: PU + Stainless Steel Color: Black Size (WidthxHeight): Approx. 21x21 cm/ 8.27x8.27 inch Back Height: Approx. 8.5 cm/ 3.35 inch Rack Width: Approx. 4 cm/ 1.57 inch Hole Distance: Approx. 4 cm/ 1.57 inch Packing List: 1 x Electric Bicycle Backrest  Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List：