player piano part--??? castor cups!!! - $5 - (Medford, OR)

could you please tell me what these are!!came in a box of player piano parts I don't have a clue as to what they arethey look like Bakelite to me ,,, but I don't knowplease help if you need them give me a offer just in Got a report that these are castor cups to protect the floorTHANKS FOR THE IMFORMATION

Posted in Medford, OR, Music Instruments
From ebay.com - 1 month ago