I have three different types of pens with different types of tips, this one doesn't fit any of them. I would like you to be more specific about what type of tennis this applies to. I've found that this works best if you buy a small bottle of eyewash. Removed about 1/8 inch from the tip and glued everything works great. I have no idea what pins are actually used, wish they would explain. This also works on any bottle with a square top. Just cut off no more than 1/8 inch and you have a pencil. Can be a little bulky but if you bought one of these and screwed it up, because it doesn't fit in any of your grips, I go to the dollar store and grab some visine eye drops an eighth of an inch from the vial and tape it to the end and it works great, a little info on the hack. Tips are great, very very very very hard, great for games. But I have three different pens and they don't work with any of them and they don't tell you what they're really for.
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