... ,friendly,waterproof,oil-resistance,nontoxic.Advantage:1,PP/cardboard material is the nice andrecycle material.2,Notebooks binding with spiral4.Good for ... you. Other details:1. Paper / Polypropylene are eco-friendly material and popular in most developed and developing countries. It's ... of water-proof, light weight,save material,can be recycle use. Keep the pp/paper products more and more popular and ...