i highly recommend not getting these. i bought a couple from J&j a while back and they were crazy dry and didn't play well at all. they were like a really crappy milk dud tip. they didn't mushroom but they also didn't hold chalk and seemed to break not cut when they were installed
I have a new package of 2 tips. If you are in the lower 48 states, I would do the 2 Tad tips for $26 shipped. I think J& J charges $30 for the pack + shipping.