There is nothing like a clean, tidy sandbox to keep children of all ages safely occupied for hours and hours. The 12" high 4' x 4' square sandbox is assembled in an hour or so, 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. Includes: 4 Stacking Joint 2-Packs, 8 Composite Plastic Timbers and 1 Square Sandbox Liner. Sand not included. For safety, please remember to use sand that is specifically made for sandboxes. This item cannot be expedited (standard delivery only).