Ouch Surge Strap On Hollow Black O/S. The surge strap on with scrotum is the perfect hollow strap on for men. This strap on consists of a hollow PVC dildo with scrotum and a comfortable elastic band, which can easily be adjusted to virtually any size. The length of the dildo is approximately 7.87 inches. The hollow space inside the dildo has a diameter of 1.37 inches. Give your penis a boost, and enjoy! Specifications dildo length 7.87 inches, circumference 4.33 inches. Materials Leather, PVC. One size fits most. Elastic adjustable straps