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These are leg extensions for Transformmission Havoc, which is a 3rd party homage to IDW Menasor. The parts add appoximately 19mm/3/4" of height to the thighs and allow for increased posability.
These are the "Narrow" versions.
The parts are designed to be compatible with the combined mode of the set.
I recommend purchasing black natural versatile plastic. Parts will arrive joined with a sprue which can be cut with Sprue cutters or a sharp hobby knife. Any white areas from the sprue can be quickly covered with a black sharpie pen.
If you wish to add a finish I recommend Tamiya Acryllic paints applied in very thin coats.
Note that it is recommended that if you purhcase these extenders you either add TFM's stability upgrade or consider the one available in my shop.