#1 Jump Rope: StoneRX Gear SRX1 Pro Speed Rope. Adjustable Cable. Metal Swivel Bearing Designed for Single, Double, & Triple Unders, Crossfit WODs. MMA, Boxing, High Intensity Functional Fitness. METAL BALL BEARINGS - for speed and precision EASILY ADJUSTABLE - resizes in seconds; one size fits all DON'T PAY EXTRA for a name; same product quality at a better price 100% SATISFACTION GUARENTEE OR MONEY BACK Don't be fooled by inferior plastic swivel ropes