1. APPLICATION Perfect size to easily attach to most barbells, dumbbells, pullup bars or cable attachments, perfect for crossfit, strength training, bodybuilding, WOD and more. Inner diameter: 3.6 cm 2. ARM STRENGTH/SIZE INCREASE Allows you to activate more muscle fibers, accelerating muscle strength and size gain in your arms and forearms. That's why many powerful bodybuilders use barbell handles during their training 3. HIGH DENSITY NON SLIP SILICONE The fat bar handles are made from a high quality high density blend. This ensures improved durability compared to cheaper alternatives and ensures that the handles do not deform or compress when used 4. INSTANT THICK BAR More than doubles the diameter of standard bars and dumbbells, which means you can practice a thick dumbbell workout for a fraction of the cost. Easily clips to all standard bars, machines, and cable attachments to ensure use during any bodybuilding exercise. Simply open the seal and place around your gear