"The Sunny Health & Fitness 40 lb Vinyl Dumbbell Set is designed to provide versatility to your workouts so you can enhance your physical strength, power, muscular growth, and muscular endurance. Our fitness weights feature a solid textured grip. The handle design features a curved center that contours to the natural arch of your hand giving the user a secure but not overly aggressive feel for a truly exceptional workout experience. The solid steel polypropylene coated bars are 17 inches long to provide ample space to accommodate the 6 interchangeable vinyl plates. The mid-point of the handle bar measures at 1.1 inches in diameter. This set includes (4) 1.5 lb weights, (4) 2.5 lb weights, and (4) 5 lb weights totaling 40 pounds when fully assembled. Polypropylene locking collar stars (0.2 lb each) tighten to hold the plates in place even during intense movements. " Bought for my son who never used them.