Gymenist Rubber coated dumbbells, sizes are clearly marked on the rubber ends of each dumbbell. The hex dumbbells are specially shaped so that they shouldn't roll on the floor if it's dropped. A great set of dumbbells for home and commercial use, lighter weights for cardio or any kind of workout that needs lighter weights (as low as 5 lb.) up to heavy bodybuilding sizes (Up to 100 lb.). These dumbbells are covered with rubber-coded and marked on each end for easy weight identification, also protect your floor not to getting scratched if it gets dropped. A Great Set of Dumbbells for Home and Commercial use, lighter weights for cardio or any kind of workout that needs Lighter weights (as low as 5-LB) up to heavy bodybuilding sizes (Up to 100-LB).