fit my off brand electric toothbrush just great

I have a generic electric toothbrush that I love and I hate trying to find replacement heads for.  I decided to try this one since you get so many in the pack versus the ones I have been buying that are so much more expensive.  These work great!  Since I just got them, I am not sure how long a head will last but with 10 in the package, I am sure I will get my money's worth out of them.  I like that they come with a protective cover on them so I can keep the head clean when not in use.