The skids are a light weight alternative to wheels. They weigh 550g each. That is 1100 g for the pair.
They are great for normal use and for towing. (See below.)
For ultra light weight checkout the skids without tracks.
These skids offer a far smaller frontal area and thus cause far less drag than a wheel. Also they feel a little less obrusive in one's line of flight when flying.
The skids measure approximately 35cm in length and 8cm width. Maximum thickness when fitted to the control frame is about 10cm.
When towing wheels and skids are now recognised by most as essential. If you happen to touch the ground shortly after take off wheels or skids make it far less likely for the control frame to catch the ground and stop resulting in a horrible nose in.
Of course there is a limit to what surfaces they work on. However if a tug can take off these skids should work. These skids will even work on a hard runway. The tracks move surprisingly well.
It should however be emphaised that these are landing skids and as such are not intended for moving aircraft around on the ground. If you move them a long way then it is likely that the skids will wear out.
A 5mm allen key is required to fit these skids to a carbon fibre AIR speed bar. The wheels locate over the lumps in special lumps in the speed bar. 2 allen head screws are tightened for each skid.
These skids can not be fitted to a round speed bar.