Bowflex selectech 1090i adjustable dumbbells single if the selecttech 552i  dumbbells aren’t heavier enough for you then you need the bowflex selectech 1090i'. '.strtoupper('t')hese replace 17 sets of weights from 4kg to 41kg 10lb to 90 lb'. '.strtoupper('t')hey work on exactly the same principal as the 552i'. '.strtoupper('y')ou just dial in your desired weight and lift out the dumbbell'. '.strtoupper('c')ombine the dumbbells with the jrny ® training  jrny™ app 2 month free trial for new members'. '.strtoupper('d')ownload this app to your smartphone or tablet and the app syncs with your device and not only remembers how much weight you lifted today, so it can make informed weight and workout recommendations tomorrow but you can also discover new strength training exercises and trainers who will keep you motivated'. '.strtoupper('a') stand with media rack is also available that can accommodate a pair of these dumbbells stand can be purchased separately'. '.strtoupper('f')eatures space saving select 17 individual dumbbell weights from 4kg to 41kg 10 to 90 lbs simple dial and lift system storage tray included sync with jrny training app size l x 44.4cm w x 24.2cm h x 25.3cm flat 17.5 x 9.5 x 10 assembled weight per dumbbell 42kg 92.4 lbs 17 weight sets from  4,7,9,11,14,16,18,20,23,25,27,30,32,34, 36,39 41kg 9,15,20,24,29,35,40,46,51,55,60,66,71,75,79,86, 90 lbs free delivery options standard one man delivery on this product we will call you to arrange a suitable dateinstallation service installation service available click for details confused by all the options'? '.strtoupper('c')all the store free on 0800 4580 081 and the team can help explain all about the inspire fid adjustable bench