3pcs replacement Virtual Ball cards (With Holes) designed specifically for use with the Billiard Stroke Training Board. These cards serve as spare or additional pieces to replace original cards that may be worn, damaged, or lost. Each card allows players to continue practicing cue stroke accuracy by visualizing the correct contact point between the cue ball and the object ball. Compatible with short, medium, and long bridge training positions, they help ensure smooth and consistent training sessions. 🔔 Important Note This is an add-on accessory. The Billiard Stroke Training Board is not included. The plastic Virtual Ball training cards may wear over time with repeated cueing. We recommend purchasing extra replacement cards to maintain your training progress without interruptions.