Battenfeld Technologies STAINLESS STEEL MEDIA 5LBS are economical and high quality. These particular pins are perfect for rotary tumbling brass, and when combined with a liquid bath, the pins provide unrivaled cleaning performance. The pins are manufactured with 304 stainless steel, which has the ability to penetrate deep inside cases, as well as primer pockets. These pins are universal, great for cleaning gun cases, and can be used with any tumbler. Just as with other products offered from Battenfeld Technologies, these stainless steel media pins are made to meet customer expectations and have a solid company guarantee.