Bowflex selectech 840 kettlebell with the bowflex selectech 840 kettlebell you can replace 6 individual kettlebells'. '.strtoupper('b')y simply rotating the dial on the top of the kettlebell you can adjust the weight from 3.5kg to 18kg 8lbs to 40lbs'. '.strtoupper('a')ll you have to do then is pick up the bowflex kettlebell with the handle and the chosen weight is selected'. '.strtoupper('c')ombine the dumbbells with the jrny ® training app on your smartphone or tablet and get trainer led workouts developed specifically for the selectech kettlebell and much more'. '.strtoupper('f')eatures space saving select 6 individual kettlebell weights from 3.6kg to 18kg 8 to 40lbs simple dial and lift system sync with jrny training app size d x 22.4cm w x 17.8cm h x 31cm flat 8.8 x 7 x 12.5 6 weight sets from  3.5, 5.5, 9, 11, 156 18kg 8, 12, 20, 25, 35 40lbs 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