you can print this in nearly every material as long as it doesn't string too much on the tips of the holder and it has enough rigidity so that it doesn't bend. The picture is “Prusament PETG Urban Grey” Also for the Nails I used two 2x23 nails. I suggest testing how the Part fits multiple times and then adjusting the depth of the nails in the wall ( be careful the two nails have to be at different depths).