The 6-sided rubber encased dumbbell is perfect for home or commercial gym use. Built with steel chrome 1.1" diameter knurled handles. WARRANTY INFO: RAGE FITNESS EQUIPMENT (WITH THE EXCEPTION OF GRIPS) IS GUARANTEED FOR A PERIOD OF ONE YEAR FROM DATE OF INVOICE AGAINST FAULTY MANUFACTURING OR DEFECTS IN MATERIAL. RAGE Fitness is built on sweat, passion, sacrifice and some of the strongest, most durable functional fitness equipment on the planet. RAGE (rāj) is all about explosive force, furious intensity and burning desire, and the products we offer prove it every day. We fuel the passion and intensity (a.k.a. the RAGE) for people who lift, jump, push, kick, run, climb, catch, twist, flip, resist, sweat and recover, and then do it all over again to push their athletic limits, reach their goals and improve their lives. The brand was born in 2008, but it didn't take long for RAGE to spread to gyms, boxes, garages and fitness clubs across the country and around the world.  RAGE erupted into retail in 2012 and since then has become the definitive, authentic and accessible functional fitness brand in sporting goods and fitness specialty.