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

2mm-4mm (50m) in the option is equivalent to a silicone tube with an inner diameter of 2mm, an outer diameter of 4mm and a length of 50m. Other specifications in the option also mean the same.

2mm-5mm (20m) in the option is equivalent to a silicone tube with an inner diameter of 2mm, an outer diameter of 5mm and a length of 20m. Other specifications in the option also mean the same.

4mm-8mm (10m) in the option is equivalent to a silicone tube with an inner diameter of 4mm, an outer diameter of 8mm and a length of 10m. Other specifications in the option also mean the same.

8mm-14mm (5m) in the option is equivalent to a silicone tube with an inner diameter of 8mm, an outer diameter of 14mm and a length of 5m. Other specifications in the option also mean the same.

19mm-25mm (3m) in the option is equivalent to a silicone tube with an inner diameter of 19mm, an outer diameter of 25mm and a length of 3M. Other specifications in the option also mean the same.