A great educational hands on activity for kids. Gemstone mining! Just a sifter or colander (sold separately) and water is all you'll need. All bags come with an educational brochure to identify your gems and fossils.  You will also be able to see where they can be found around the world. Additionally, BB+ (Big Bag Plus Surprise) contains over a half pound of gems, fossils, shark teeth, and a HUGE surprise in every bag!