https://www.bio-material.net/Plastic-sock-hanger.html Plastic Sock Hook A plastic sock hook is a small plastic item used to hang socks. Traditional plastic sock hooks are usually made of petrochemical plastics, causing serious pollution to the environment. However, with the advent of pla bio-degradable materials, the material for making plastic sock hooks has been revolutionized. Pla material is a plastic made from renewable plant resources, which has similar properties to traditional plastics, but can be completely degraded in the natural environment.