Mounting strips are used...

Mounting Strips

MegaTree Mountening Strip für 12mm RGB-Pixel/RGB-Dumb-Pixel (schwarz)

Mounting strips are used to mount our 12mm RGB-Pixel/RGB-Dumb-Pixel. With constant spacing between mounting holes, it's easy to build "MegaTrees" or to edge your windows and house edges.

And in no time. You do not have to measure distances for hours and drill holes in expensive PVC pipes. Just click the RGB-Pixel/RGB-Dumb-Pixel into the mounting holes and you're done.