A tube typically serves as a medium providing versatile features from fluid transportation to other structural applications. It is a usually cylindrical shape, or square, round, rectangular cross-section. A tube may be flexible or rigid depending upon what the tube applies for.
As for silicone tube, as its name show is made of silicone. Through extrusion mold silicone into the tube, which owns flexibility, temperature resistance, and bio-compatibility. Many industries make a close tie with silicone it.

Silicone rubber is a new type of elastic polymer material that has excellent resistance to high temperatures (250-300 – c) and (- 40 to 60 c) in low-temperature resistance, good physical stability, and can withstand repeated harsh and sterilization conditions, excellent resilience and permanent deformation (200 ° C48 hours not greater than 50%), breakdown voltage for (20-2 5 kV/mm). It can also have ozone, ultraviolet resistance, and radiation resistance, and special silicone rubber has oil-resistant performance.