This is a Teflon (PTFE) tube with a length of 1 meter from Creality, a popular manufacturer of 3D printer accessories. The Teflon tube is mainly used in 3D printers with a Bowden extruder, where the filament travels through this tube from the extruder to the hotend. Teflon is a material with a very low coefficient of friction, which facilitates smooth and precise filament feeding, reducing the risk of jamming.