20mm pliable conduit that can be preformed by hand and will retain its shape around the contours of uneven surfaces. id 14.6mm od 21mm supplied in 10M coils. Colour black. Construction Smooth inner bore of Kraft paper with metallic spiral of leaded steel support, PVC oversheath. Temperature rating -20 to +70 C. Protection rating IP67. Flammability Self extinguishing with 10 second flame resistance. resistance definition Class 3 medium 940 newtons. Mechanical tensile strength Class 3 medium 550 newtons.. 10m in length.