Thumler's Tumbler R3 rubber molded barrel (stock No. 202) is a replacement or extra barrel for any three pound Thumler's Tumblers. (Three pound capacity barrel). The approx. size of the complete barrel with lid is 5" wide by 4 1/4" deep. Retail price is $19.00 each, but the complete new barrel will receive a discount of 10% at the SHOPPING CART. Make quick and easy changes in tumbler start up by having an extra barrel handy, then clean your barrel at your leasure. Barrel will come with lid and retainer ring. Gently roll the ring from the top and slightly squeeze the rubber barrel and the lid will be easy to remove. If you need a retainer ring only, they are listed in the Lapidary Parts and Supplies category.