There is nothing like a clean tidy sandbox to keep children of all ages safely occupied for hours and hours. The 6" high 4' x 4' square sandbox is ssembled in less than an hour, using the Frame It All joints and four feet long composite plastic timbers, which never rot, splinter and warp or lose their gorgeous natural wood grain finish. Don't forget to also purchase the heavy duty customized sandbox cover to keep it clean and dry. Cover sold separately below. Includes 2 Stacking Joint 2-Packs, 4 Composite Plastic Timbers and 1 Square Sandbox liner. Easy to install.