MATERIAL:The quality of the material is very high.Thick sponge provide comfortable feeling and surface can be cleaned more . CUSHION SIZE: The seat cushion is a fairly simple pad which is onto a bike rack by straps (bike rack NOT included). The weight limit would be the weight limit of the rack. EASY TO INSTALL:A nice flat heavy duty bike rack is needed to mount it.It easy to adjust to any bike rack.Can be used on standard Back Seat and univeral for most of bike. COMFORTABLE AND SAFETY: The wide padded seat and backrest ensures a comfortable riding position.The Armrest Handrail and Footrest added security for your childrens safety.PLEASE NOTE:For children over 5 years old. It is very comfortable and ultra sturdy.Black with Line Pattern looks fashionable and beautiful, Whatsmore,it can make your child safety.Neat appearance make travel full of fun.With these bike accessory set, kids can lean back and relax when you are riding. colour: black Material: sponge + metal size: 34cm*16cm Package Contents: 1*Cushion 1*Back 1*Armrest 2*Foot Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.