SAFETY NUTS：The set contains four safety nuts. in 1 Dumbbell Set. Adjustable Dumbbells 20/30/40/60/80lbs Free Weight Set 4. The connecting bar is made of 5mm thick steel tube + 20mm thick high quality foam, which is soft, non-slip and sweat-absorbent, and the curved design is ergonomic to fit your neck and reduce the pressure on your shoulders, making you more comfortable during exercise.
