Yep them things... couple of quid on ali express, got em with a pair of fret guards / shields... handy for 0000 Wire wool n Polishing the frets and (whisper...) lemon oil on a rosewood board.
bend a thin bit of metal and wrap in electrical tape... nowt special.
and for a fret guard, cut an old store card or credit card in half and then tape leaving a fret gap...