TheStack TheStack Hardware 5 milled Stack weights enable 30 weight combinations between 0g and 300g Dual-purpose weight case / phone stand Highly engineered training club - Adult (41.5") or Junior (38.5") version (see Fitting Juniors) Stack training requires a speed device that can measure swings without ball impact. We recommend bundling with Stack Radar (Bluetooth connectivity). View all compatible devices below. Compatible Devices Brand & Model Compatible Stack App Connectivity TheStack - Stack Radar ✔ ✔ PRGR - Black Pocket, Red Pocket ✔ Rapsodo - MLM2PRO, MLM ✔ Flightscope - Mevo+ ✔ ✔ Flightscope - Mevo ✔ FlightScope - X3, X2, X2 Elite, Xi Tour ✔ ✔ Trackman - Trackman4 (TPS) ✔ Foresight - QuadMAX ✔ Voice Caddie - SC200 Plus ✔ Garmin - G80 ✔ Sport Sensors - Swing Speed Radar (SSR) ✔ Yupiteru - GST-5, GST-7 BLE ✔ *Other speed tracking devices may be capable of non-impact swings and can be used with TheStack App. We will continue to test new devices and keep this list current. Disclosure: We may earn commission on some of the links below. TheStack App Training Rated 4.9 with over 4,400 Reviews on App Store Includes 1-Year Membership to TheStack App, accessible on iOS Adaptive speed training formulated by Dr. Sasho MacKenzie Guided workout timer for reps, sets, and rest intervals Custom speed metrics to track your gains Bluetooth Connectivity to integration devices. Hands-free data entry using voice entry technology for non-integrated devices Member Bundled access to Stack Putting ($59 value) and the Learning Library Train and track up to twenty local (i.e. family) users under one login. App works with Family Sharing so the entire family can train easily on separate devices Connect to any other Stacker using Share Codes Are you a Coach? Learn about our Coaches License Access TheStack App from the App Store when your order arrives. Requires iOS 15.0 or newer. See our FAQ pages for questions about membership access. * Speed radar not included