POWERBLOCK ADJUSTABLE DUMBBELLS - PRO 50. These adjustable dumbbells only measure about 13" x 7" x 7.25" but can be adjusted from 5 to 50 lbs per dumbbell in 2.5 lb increments. Urethane-coated steel plates. Optional extras from the manufacturer let you convert to a kettlebell, curl bar or barbell - I don't have these attachments. The dumbbells cost $603.90 new. These are in like new condition. Sell for $495 cash