Designed to work with the Big Green BirdieWedge or a regular golf club, these miniature tennis balls work great indoors or outdoors for golf practice on the go. The max travel distance for these practice balls when hit with the BirdieWedge is about 50 yards. These will stick to targets made from male/hook velcro, so they’re perfect for target practice and accuracy exercises.  Check out the Big Green BirdieWedge here.