I have been golfing for over 15 years and NEVER knew this type of tee existed until I found one on the course! I immediately looked for them at Amazon and was thrilled to have found them. One of my biggest struggles with golfing with others, especially strangers, is when I have to tee up and the ball keeps falling off the tee. Problem solved! These are excellent! The circle is 3 3/4" across. By far, the BEST tee I've ever had! I bought myself and a friend each a pack of 60 and will never need to buy them again, ever. We've only broken 1 each in the 2 years we've had them, whereas the other types had at least 1/2 dozen broken each game. Plus, with their wide top, they are super easy to place the ball on the tee (in case you don't have the steadiest of hands, like me). They are a 10/10.