50 is the magic number and then take a towel to stick all the pins too when your dd is done trading and then put the towel on the shelf as a keepsake for later in life. Remember the cooler the pin the more the other teams will want to trade. When we took our team to Nat's at 10 they had really cheap pens and nobody wanted to trade, so dd hates trading pens to this day, she traded 5 at 14U ASA/USA last year. lol