Frankford Arsenal stainless steel media pins are ideal for rotary tumbling brass. When combined with a liquid bath they deliver unmatched cleaning performance. Constructed of high quality 304 stainless steel, the media pins effectively penetrate inside of cases and primer pockets. 5 lb. 304 stainless steel. Ideal for rotary tumbling. Magnetic for convenient handling and lifetime use.Features:Ideal for rotary tumblingMagnetic for convenient handlingLifetime use