• Beware of cheap imitations on the market. 
• The Muscle Ball Stretcher by Sport Fucker is by far the most comfortable Silicone Ball Stretcher on the market! What makes the Muscle Ball Strecher so comfortable? First the design. 
• It's nice and thick, adding a good amount of weight to your sack, without a constant pain you may have with metal ball weights. But more importantly is the All New Silicone used to make these Muscle Ball Stretchers. 
• You HAVE TO feel them to understand. Words do not do the material justice, but to try, we would describe the all new silicone as silky, stretchy and firm.
• Dimensions:
• Inside Diameter is 1.25.
• Outside Diameter is 2.25.
• Height is 1.60.