Two glass tanks, both used for nonaquatic pets (geckos and mice). Large one is apprx. 30" x 10.5" x 12" and the smaller one is 20" x 12" x 20". Large one comes with a tank divider and fake rock wall, thermometer and slightly damaged top. It did keep our gecko in. The small tank has a very sturdy metal wire cover. They might hold water, but we never tried.