... zipper bag is harmless to people 3.this zipper bag is durable Item NO. :QSB002-5(1) Material:PVC, EVA, TPU, PVC ... design with metal(button) snap, zip lock, nylon zipper, mini grip.(4) Process:sewing or heat seal ... produced various stationery and packaging bags in fabric,PVC,EVA,TPU.2.more than 10 years ... , service foremost(8)Key Words:zipper bag , Durable stationery zipper bag , school pvc zipper bag