Restoration of release of VZ-8 practice device of serve, volley, stroke Posted 09/05/201802/21/2019 miracle2018Leave a commentPosted in information, News Letter Super tennis practice machine, VZ – 8 arrived. You can practice tennis at your house. Yes, Miracle Tennis is the closest wall-hitting tennis. The number is limited. In a few days, ServeyNet, VolleyNet, magical racket will also resume sales.