Kids "Kidz Gritz" Refill Rock Tumbler Grit Kit Polishes 1/2 lb of Rocks Made in the USA - Grits Pre Measured for Precise use in all "KIDZ" size 1/2 Lb capacity Rock Tumblers. Great for All small, beginner Rock Tumblers 1/2 lb capacity & larger including:Dr.Cool, Nat'l Geographic, NSI Rolling Stones,Smithsonian & more This Kit Contains the same Quality Grits as the Pros Use! Achieve a "Glass Like" Polish Like The Pros! Kit Includes Grits, 1/4 lb rough mixed premium agates from Mexico & jewelry findings as shown with instructions & extensive Tips. Easy to use, pre-measured Grits Produce superior results.(please allow for substitutions of equal or greater value) Achieve Superior Results-The Same as what the Pros Get! Except for the Adhesive-A Complete "Kidz" size Grit Kit!