COMMAND. Made to Play Hard. Master your urges with Sir Richard’s Harness with Hollow Strap-On. With a full 8” of fulfillment, this dominating harness set includes an impressive hollow strap-on held securely in place by a thick, durable industrial-strength nylon strap harness. The Heavy-Duty Harness features fully adjustable stainless steel lock rings, allowing for a controlled, custom fit every time.