Any sizable jumprope. Most polyester ropes come very long. You take the caps off and then size it to what you need. They’re cheap, last longer than leather and most plastic ropes, and you can jump inside buildings and gyms without damaging the floor. Here’s a good one on Amazon that I’ve been buying for a while. At the time of writing I’ve split 9 ropes. These have lasted me the longest. https://www.amazon.com/gp/aw/d/B00SAY9LLC?psc=1&ref=ppx_pop_mob_b_asin_image