Amazon.com : Sonic Boom M2 High Speed Jump Rope - Patent Pending Self-Locking, Screw-Free Design – Weighted, 360 Degree Spin, Silicone Grip with 2 Speed Rope Cables for Home Workout, & More :
Amazon.com : Gaiam Classic Speed Rope for Women and Men - Jumping Rope for Fitness and Exercise - Lightweight, Tangle-Free, Portable, and Adjustable Jump Rope for Training, Cardio, Aerobic Skipping : Sports