Pair of Hex Dumbbell hand weights for body building, strength training and muscle building. Solid steel heads with Rubber coating Ergo-grip chromed Steel handle Medium-grade knurling for optimal grip Fully welded as single-piece unit Different sizes available; 5kg, 7kg, 10kg, 12.5kg 15kg, 20kg, 22.5kg, 25kg 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. . 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. . In sum, dumbbells are good for: building muscles, improving cardio health & blood flow, aid weight loss, improve muscular endurance and bone health.