Having a special golf event? Custom printed foil balloons shaped like golf balls will personalize your event and make it memorable. Great as a party decoration for the golf fan. Golf Ball Themed Balloons. These are unprinted sports shaped balloons. Balloons are approx. 18 inch in diameter and are mylar (aka foil) balloons. Balloons are made to look like a golf-ball and are perfect for helping you to create a golf themed party or event. Since they are mylar balloons they are reusable up to 5 times and have a long float time if you use helium.