This triangle climber playing set uses 100% premium natural wood as materials as the triangle climbing ladder is made of 21 round beech wood strips, the frame is made of poplar core and the ramp is made of birch, which is very durable and strong. The Surface is coated with a Non-toxic Bpa free which is more environmentally friendly, safe, and durable than plastic materials, thus creating a safe environment for your kids when playing.