The Flexibell is the latest innovation in Home Fitness, replacing multiple sets of weights. 1 Flexibell is equivalent to 15 different dumbbells. The product has easy-to-use selection dials for adjusting weights. The weights adjust from 2.5 to 24 Kgs / 40Kgs in 1-1.5 Kg increments. Please note that the weight levels on the dial are approximates. & the weight can have a variance of +-5% from indicative weights.