- Diameters of rings: 1.5in (3.81cm) and 1.75 (4.5cm) - Distance between rings: .75in (1.9cm) - Length: 1.25in (3.17cm) - Helps maintain erection size, rigidity, and duration. Stockroom.com is thrilled to introduce the KinkLab line. Test the limits of pleasure with aid from high-quality, appealing, and functional products. KinkLab products are designed to help you realise your own visions of how passionate, creative, and positively charged your erotic life can be. These products and their packaging are designed in the USA. The unique packaging displays these products clearly and honestly. In many cases the packaging is also reusable and provides a functional and attractive place for you to store your toys for future use.