PlateMate 2.5 lb. BRICK (Single) - Magnetic Add-On Weight for Selectorized Weight Stack Machines Includes (1) Brick Shaped Magnetic Add-On Weight, 2.5 lbs. Attaches to metal weights securely with super-strong magnet. Weight Stack NOT Included. Designed specifically for selectorized or stack weight machines. Build strength steadily with 2.5 lb increments instead of the typical 10 or 15 lb increases. Will not magnetically stick properly to surfaces coated with rubber, urethane, neoprene, vinyl.