特征：具备单排硅胶直管的大多数性能；
应用：电气元器件或设备仪器需要对内外层硅胶材料有不同性能的要求；
颜色层数：2层(内外)；
定制需求：内径、外径、长度、材料等级、硬度、颜色等。

Features: Possess most of the performance of a single row silicone straight pipe;

Application: Electrical components or equipment instruments require different performance requirements for the inner and outer silicone materials;

Color layer: 2 layers (inside and outside);

Customization requirements: inner diameter, outer diameter, length, material grade, hardness, color, etc.