Frame It All One Inch Series 7' x 8' x 11" Composite Hexagon Sandbox Kit Eco-friendly timbers are made from recycled plastic and natural fibers. No toxic chemicals. Frame It All&rsquo;s modular system allows endless design options. You can add on or reconfigure your sandbox at any time using existing or additional One Inch Series Frame It All components and accessories. Low maintenance - timbers will not rot, warp, splinter or fade. Composite boards are made from 38% post-consumer recycled plastic and 62% sustainable hardwood fibers. One Inch Series composite kits are made from 1in. thick, rounded profile boards.