Approximately 2 lbs. - 2+ lbs. per box. Material could consist of Quartz, River stone, Jasper, Agate, Rhyolite, petrified wood, among other materials possible. Your box will consist of around 2 plump measuring cups, or equaling at least 2 pounds/2 pounds+ of rock. Sizes of rocks vary, most are small, some may need to be broken down for the tumbler depending on the size of tumbler you have. All materials are raw, natural, and unaltered. Pictures are only examples of what you may get. Fun for the kiddos and adults too! Please allow for 1 - 2 business days to ship out. If you have any questions, please do not hesitate to contact me. Thanks for looking!