SKLZ Ball-First Trainer Ball-Striking Mat The Ball-First Trainer mat is designed to perfect your swing accuracy, consistency, and power. The mat encourages a proper lag, a downward strike, and a square clubface at impact. Use the markers on the mat for comparison analysis of divots to original ball placement. Ball-First Trainer Features: Holes for golf tees stabilize the mat ◦ Visual club path guides ◦ Durable flexible material can be stuffed into any golf bag and used anywhere ◦ 17 x 9.5 inches Practice Your Way To Better Golf!