DMM made the V-Twin Belay Device out of stainless steel instead of aluminum to increase durability and keep it cooler on long rappels. The deep V-shaped grooves provide solid breaking performance on ropes ranging from 8 to 10.5mm, so you can take it along whether you're using your fatty on a sport route or bringing twins on an ice line. You may expect the V-Twin Belay Device to be heavy, but thanks to DMM's investment casting manufacturing process and close tolerances, it weights a mere 3.1oz.