The original black rubber end pin tip on my Upton bass was leaving black marks on light colored carpeting. My jazz guitarist's wife was complaining. So to ensure domestic tranquility (and not get kicked out of our practice space) I set about to replace the tip. I went to the hardware store and bought white chair tips. The package of 4 was about $6. I was originally going to cut the whole end pin tip off and replace with a 3/4" inside diameter tip, but then the chair tip would be too short. Then I realized that I only needed to cut the "collar" off my end pin tip and use a larger 1" inside diameter tip. The chair tip is still short but the black inner tip shows. Now everybody is happy.