HappyBalls Green Alien Car Antenna Topper  /  Car Mirror Dangler Official HappyBalls USA Trademarked Brand. Shop Direct with Us Here at Seller Name Tenna Tops to Get Our Authentic Antenna Toppers. We have 3 U.S. Trademarked Brands on Amazon. Tenna Tops, CoolBalls and HappyBalls. Birthplace is Roswell, NM.Hole size 4.5 mm Diameter. High Quality Waterproof Design. Alien About 3 Inches Height Rear View Mirror Hanger Accessory Included