The tube with built-in steel wire is stronger and more flexible. It is 27cm in length with two 1/4" screw holes at both ends for extension. The net weight is about 120g.
1 x 27cm Flexible Metal Tube IS-RG
2 x 1/4" to 1/4" Adapter Screw IS-S
(The other items in the photos not listed here are for illustrating only, not included)