VTX by Troy Barbell MDR-NPAC Aerobic Pac Locking Rack & 43 Pairs of Neoprene Coated Dumbbells, One Size The Aerobic Pac features easy stackable compartments that provide an attractive, convenient way to secure, store and display your aerobic dumbbells. A lockable rack to secure your neoprene coated dumbbells. (Model MDR) 43 pairs of neoprene coated dumbbells. (14-1 lb., 12-2 lb., 18-3 lb., 16-5 lb., 14-8 lb. and 12-10 lb. neoprene dumbbells) (Model NPAC) Product Shipping Weight : 489 lbs.