Using an Rx Jump Rope on concrete, asphalt, dirt, gravel or any other abrasive surface will automatically void the Manufacturer's Warranty. The purchaser takes full responsibility to return the product back to Rx Smart Gear, Inc. for inspection and/or repairs. Nov 26, 2013 · At the start of the year The Rx Review put the very first, and original, RPM Speed Rope to the test. At the time, we rated it as one of the best speed ropes on the market for any CrossFitter, competitive jump-roper, or fitness enthusiast. So when we heard a new and improved RPM Jump Rope was being designed, we were eager to put it to the test. Price and other details may vary based on size and color. Rx Jump Rope - Black Ops Handles with Trans Black Cable Buff 3.4 9'0" 4.4 out of 5 stars 26. $47.00 $ 47. 00. The Rx Jump Rope by Rx Smart Gear is made custom to the individual buying the rope. This rope looks industrial, and it is made with durable materials. This jump rope includes an attachment that allows the mechanism to swivel. The company patents this design. The design gives the user more control over the speed of the rope. NEVER bend, kink, or tie your Rx Jump Rope in a knot. This will drastically reduce its efficiency and life span. Keep your Rx Jump Rope from getting wet whenever possible. Rust can occur on the metal parts within the swivel and bearing system. For sizing Rx jump ropes see the chart at the top of the page.