They're knobs! Plastic things made of plastic and some colourant to give it that amber look? They are made for US pots (CTS, etc.) so if your PRS SE has Alpha pots, these will not fit but not a huge deal, you can always open up the split on your alpha pots slight (carefully, otherwise you may snap it) or add plumber's tape (PTFE) one wrap or so so add girth to the shaft of the pot. Personally, I changed the pots of my PRS SE anyway to CTS so these were a perfect fit.