when they're passed 100 lbs. So my gym doesn't carry 105, 115, 125, etc dumbbells. I thought about purchasing plate mates or WEGGs (magnets that are attached to the dumbbell). But the problem is that these new dumbbells are rubber coated so I don't know if the magnets will hold properly. Any suggestions? These are the dumbbells my gym carries Troy 12-Sided Rubber Encased Dumbbell w/Chrome Steel Handle [TSD-R] : Gain Weight (MUSCLE) or Lose Weight (FAT) - Workout and Diet Programs - Discount Fitness Products, Bodybuilding and Weight Loss Information