The Lortone model 33B tumbler is a real workhorse. It features two 3 pound capacity barrels that will give the user years of trouble free service. The barrels are hard rubber to minimize noise and the durable motor will last for years. Simple to operate and UL approved. One-year warranty. The included highly polished stainless steel shot mixture known as "Jewelers" Mix" is a combination of three shapes: diagonal, round and pin. Each does a different job in burnishing metals to a mirror bright finish in a minimum amount of time. For almost all applications, it is the only shot combination you"ll ever need. Stainless steel shot requires only occasional cleaning. Because it is stainless steel, it is rust and corrosion resistant and is able to stand up to strong compounds. This bundle includes two pounds of Jewelers" Mix Stainless Steel Shot. Also included in this bundle is an exclusive article by jewelry artist Charlene Anderson. This article outlines basic tumbling equipment, supplies, and techniques for getting the most out of your tumbler and shot. Learn the secrets to smooth, shiny jewelry from your tumbler. Article ©2012 Charlene Anderson