Only HomeCourse Golf ProScreen 180 lets you use a real golf ball - worry free - when playing or practicing indoors. The Sky Net and Pro Arms create a three-sided, topped enclosure to help contain errant shots or sh**ks (we dare not say it) - protecting you, your space, and everyone in it. And with the included Pro Arm Extender tool, you can easily fold out both or one of the enclosure's sides (and close one for righties or lefties). When you're done, the sides fold right back in.