The item shown is a light-weight, adjustable dumbbell typically used for home workouts and toning exercises.
These are often marketed as 4-in-1 sets for women, featuring rapid weight adjustment mechanisms.
The weight range is typically small, commonly from 1kg to 2.5kg per dumbbell, or 2lb to 5lb.
They feature a space-saving design, combining multiple small weights into a single unit.
They are designed with square or flat edges to prevent them from rolling when placed on the floor.