Buy as many as you need (without cutting) a whole length.

0.8mm-1.6mm (20m) in the option is equivalent to a transparent tube with an inner diameter of 0.8mm, an outer diameter of 1.6mm and a length of 20m. Other specifications in the option also mean the same.

1.6mm-3.2mm (10m) in the option is equivalent to a transparent tube with an inner diameter of 1.6mm, an outer diameter of 3.2mm and a length of 10m. Other specifications in the option also mean the same.

3mm-6mm (5m) in the option is equivalent to a transparent tube with an inner diameter of 3mm, an outer diameter of 6mm and a length of 5m. Other specifications in the option also mean the same.

6mm-10mm (3m) in the option is equivalent to a transparent tube with an inner diameter of 6mm, an outer diameter of 10mm and a length of 3M. Other specifications in the option also mean the same.

10mm-14mm (2m) in the option is equivalent to a transparent tube with an inner diameter of 10mm, an outer diameter of 14mm and a length of 2m. Other specifications in the option also mean the same.

18mm-22mm (1m) in the option is equivalent to a transparent tube with an inner diameter of 18mm, an outer diameter of 22mm and a length of 1m. Other specifications in the option also mean the same.