Specifications: Material: silicone Size: 1* letter tray bottom mold, 13.4x9.6" 2*desk organizer sides mold,9.8x3" 1* behind mold,13.4x3.5" Package includes: 4 pieces / set File Tray Molds Feature: You can use the resin casting mold to DIY your personalized unique file and cosmetic organizer trays,multilayers letter/jewelry trays etc. Our file holder resin mold is reusable. You can use release spray or soap water to extend silicone mold's life. Our silicone resin molds are compatible with most casting material,You can DIY your creative resin project in differnt ways. Ideal gift for the resin craft lover, share happiness with your friends and family.