rubber coated hex dumbbell Spec: 10lb,15lb,...100lb 5lb per increasement 1kg,2kg ,3kg,....10kg, 1kg per increasement 2.5kg, 5kg, 7.5kg,...50kg 2.5kg per increasement 1.help improve muscle tone and core strength2.various weight to satisfy differert need .3.colour per customers quirements4.high quality and low price