Open up huge possibilities in your workout space with the Cortex 4kg, 6kg, 8kg & 10kg Hex Dumbbell Set. Progress your training gradually with 4 weight pairs increasing at 2kg increments. Find the right weights to target and isolate muscle groups, or add dumbbells to your body weight workout to increase resistance and challenge. These dumbbells are safe for home or gym use with hexagonal rubber coated heads to reduce rolling and damage to floors and walls.