Iron Grip’s heavy-duty dumbbells are built in the USA to deliver superior safety and durability. They press fit their steel handle into a precision-machined solid steel head under extreme pressure, and then apply a proprietary welding process to the joint for added stability. Iron Grip urethane is formulated in the U.S. for superior strength and longevity. It will never tear or delaminate and won’t scuff or damage equipment, walls or floors. And the hard-wearing textured finish is designed to better resist wear and tear, and keep your dumbbells looking new longer.