- br br Best Bargain Review - Bowflex SelectTech 552 Adjustable Dumbbellsbr br Manufacturer's Warrantybr Two-year limited warranty on all parts; five-year warranty on weight plates; one-year warranty on laborbr br Product Descriptionbr Dial up results! The power of 30 standard dumbbells is in these redesigned SelectTech Dumbbells by Bowflex. Each dumbbell adjusts from 5 to 52.5 lbs., allowing you to build strength, loose weight and feel great! Compact and durable.