Adult novelty manufacturer Doc Johnson has re-released the Tower of Power set of cock rings in a fresh, new black edition.

The Tower of Power is a set of six stretch-to-fit cock rings made from phthalate-free TPR. Each cock ring is designed to prolong an erection and deliver distinct stimulation.

"The Tower of Power was originally released a few years back and was a huge success for us," said Chad Braverman, Doc Johnson' s director of product development and licensing. "Customers loved the variety this item offered and the low price point. After receiving many requests for a new color, we chose to release this chic black edition. It looks great, and will drive a whole new market to this item."