Thank you for viewing! First come, first served! Immediate purchase without comment is OK! [Product Description] The MOMENTUS Ace Trainer is a training device specifically designed for practicing swings in tennis, including serves, forehands, backhands, and volleys. Due to its special weight balance, it is used to acquire the correct swing path, utilize centrifugal force, stabilize the hitting point, and improve swing speed. Tennis swing practice: Learning the correct form for serves, forehands, backhands, and volleys. "Magic Wand" effect: The weight (sliding weight) moves in the correct position, allowing you to experience the feeling of acceleration using centrifugal force. Hitting point stability: The weight clicks in front of the swing, naturally moving the hitting point forward, enabling powerful shots. Training effect: Heavier than a regular racket, it can be expected to improve swing speed and build muscle strength. [Condition] Although it is a beautiful item, there may be scratches and stains due to use. Please understand that this is a used item. Other conditions will be shown in the photos as much as possible. [Packaging and Shipping] It will be wrapped in bubble wrap and packed in cardboard, plastic wrap, etc., for shipping. We will ship as soon as possible, at the latest the next day! Please note that the person who purchases the item will take priority, even during comments and exchanges. Thank you very much!