Since they were introduced
April 12, 2016
I have used these since they first came on the market and have been teased about them ever since, but, everybody who tries them, likes them, the only thing they complain about is the price. I buy them when they are on sale. A two pack of the jumbo size lasts easily a full year and I don't have to look all over the tee box to find it after I hit!
Pros:Holds the ball well and easy to see.