Fat Boy Stretcher 2.0 The super stretchy ball stretcher that fits any man and is soooo soft! Category: Fat Boy Line of SilaSkin Products, Cock and Ball Toys materials: SilaSkin TPR/Silicone Blend. Safety Rating: EN-71 -3. Made of SilaSkin this product has stretch factor 1200%! SilaSkin is irresistibly soft and safe with all lubes. SilaSkin is a proprietary blend of TPR and Silicone.