Here's a new twist on the classic sandbox play sets! KwikSand is moldable, it never dries out, it does not stick or make a mess if it touches skin or fabric, and it can be used over and over again for creating numerous sculptures. Sets are themed (the colorful, sturdy box bottom doubles as the play tray) and include a couple of micro molds as well as other toys to add playability to the sand sculptures. Mini sets include sand, micro molds and toys, but the box is not suitable as a play tray. We also have sand refills (approximately 1.25 pounds per pack) in case you want to add (or replace!) sand to your boxes. Colors are noted in parentheses for matching sets and refills. Note: Egyptian Mummy and Knight's Castle sets have colors that are not matched by any refill set.