Genuine Capricorn Tubing 1 Meter XS Series 1.75MM Filament with Upgraded PC4-M6 and PC4-M10 Pneumatic Fittings & Capricorn Tube Cutter for Creality Ender 3/Pro Ender 5 CR-10/10S 3D Printer https://www.amazon.com/dp/B0915V313C/ref=cm_sw_r_apan_glt_fabc_Y8AEPD9B9XMPRVFKV1C4?_encoding=UTF8&psc=1.

This the one I bought and it works great. Also has one of those nice cutters with it!