These are excellent for safe handling of radioactive material! No fear of shedding particles with everything locked in the glass like epoxy resin. 10 dollara for the smallest size and 10 dollar increments. Order 1 for extra small size, 2 for small, 3 for medium, 4 for large, and order a quantity of 5 for the extra large size. For Uranium glass lovers this can also be filled with much more UV reactive Autunite! Please feel free to reach out for a collaboration on your radioactive resin piece. The Uraninite is sourced from Utah, the Autunite is from the Daybreak Mine in Spokane, Washington. They are handmade so the readings vary as well as the appearance.