if you be in the market for these type of `` dumbell '' -lrb- one that you can quickly change weight on -rrb- and be terrify of the really expensive alternative , do not look any further . these work exactly as advertise . as long as 24 lb on each hand be heavy enough for you , you 'll be very happy . the square shape make they easy to store and if you secure they properly , they be very safe and easy to use . they be shape well enough that you can even use both hand on one block for those exercise that require it . the `` change '' system be definitely not as fancy as the pricier competition - but it work .