Power Systems Single Tricep Rope Attachment with Rubber Stopper for Cable Machine Systems, 15 x 1.25 Inches, Black (50735) Strong, black nylon rope with rubber stopper Designed for single arm exercises Attachment easily clips to cable machines 15 x 1.25 inch diameter Weight training accessory for speed, agility, strength, power, running, football, volleyball, basketball, baseball, soccer and all other athletic, fitness, weight, or cross training