Main features:
1. close structure and equal force
2. outer diameter meets demands for communication technical regulation.
3. good low temperature elasticity and others.
4. small friction force for inner wall of pipes.
5. good low temperature for brittle fracture
6. obvious social and economic benefits.
Main use:
Widely used in power and communication industries.
Specification: three-hole, five-hole, seven-hole and nine-hole.