Environmentally friendly materials: Leather cushion, stainless steel pipe, soft armrest, Breathable mesh fence(Made of breathable sponge). non toxic, odorless, durable and safe to use. Safety: Non slip handrails and pedals keep children safe, comfortable and free when riding, does not touch the legs, comes with installation tools and safety belts to ensure the safety of children. Stability: Suitable for more stable, firm, safe, thickened and widened cushions for baby sitting. Easy to install: Powerful quick disconnect assembly for easy installation and removal of seats, suitable for all kinds of bicycles, such as mountain bikes, electric cars, etc. Important parameters: Bicycle rear seat width: 13in, height: 7in. Backrest height: 12in,maximum load 100pound/ 45kg, suitable for children aged 2-7.