Magnetic: Must come in direct contact with metal for an ultimate hold. They will NOT magnetically stick properly to surfaces coated with rubber, urethane, neoprene, vinyl.
Patented Design: Works with steel or cast iron plates and dumbbells
Protective Coating: On the outer surface (opposite from magnets) prevents scratching of dumbbells, equipment, or each other during use or storage.
Important Note: PlateMate® Donuts will NOT fit around Olympic barbells. They are intended to fit over 1" Pro-style dumbbells!
Intended for use with25lb dumbbells and higher.It is important to make sure your dumbbells are large enough to fit the4"x4" magnetic surface area.