Durable materials--soft high-density sponge, wooden planks on cushions and backrests; sturdy steel armrests. The thick sponge provides a comfortable feeling and is easier to clean.The general size suitable for most bicycles-the size of the seat cushion is about 42.0 cm * 21.0 cm * 27.0 cm. . The seat cushion is a fairly simple cushion that is fixed to the bicycle frame by straps (not including the bicycle frame). The weight limit will be the weight limit of the rack.Easy to install-a nice flat heavy bike rack is needed to install it. Can be easily adjusted to fit any bike rack. It can be used in standard rear seats and most bicycles.Comfort and safety-the large upholstered seat and backrest ensure a comfortable riding posture. Armrests and footrests increase safety for your child's safety and are super sturdy. Please note: Suitable for children over 5 years old.An excellent child seat for bicycles-Classic Black can easily match any color bicycles, and more importantly, it can keep your children safe. The neat appearance makes traveling full of fun, without worrying about the risk of children falling while sitting on the back seat of the bicycle.