Pair of plastic adjustable dumbbell hand weights. Different weight sets available; Pairs of 5kg, 7.5kg, 10kg, 15kg

It's detachable, so you can work with the KG you want at any moment. Made of cement with plastic covering (PVC).

It also comes with a connector bar, which can be used as a barbell.

Dumbbells are versatile and easy-to-use weights that help you perform a variety of workouts to improve your health. Depending on the weight you use, the number of repetitions you do and pace at which you use them, dumbbells can help you improve cardiovascular fitness, burn calories, build muscle or increase muscular endurance for sports.
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Dumbbells come in different weights, starting with the smaller lightweight types used during aerobic workouts or while using a treadmill or exercise bike. Heavier dumbbells are for body-building.
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In sum, dumbbells are good for: building muscles, improving cardio health & blood flow, aid weight loss, improve muscular endurance and bone health.