✔【THICKER MATERIAL AND PERFECT WORKMANSHIP】 Classroom Pocket Charts for Cell Phone and Calculator Holders is made of 100g durable non-woven fabric, and clear pockets with 0.12mm PVC, AOZ free and environmentally friendly. The double stitch sewing is much more durable and the material was upgraded to be thicker, which extend the service life of the product even longer than other similar products.