I've had these in my sticks for years now. I was frustrated that they seemed to disappear as I wanted to keep using them in newer sticks. Fortunately I saw that Sport Stop started to sell them again last year. They're easily installed and will never come out (remember that).Pros:
Easy to install
Multiple colors available
Don't tell anyone they're "removable" this is absolutely not the case. Once this is in a shaft it isn't coming out without a ton of effort and the fingers on the inside breaking off.
Price? $10 is a little pricey