This is a high precision green reading aid golf ball marker, designed for both male and female golf players. Made of durable hard plastic material, it is compact and portable to carry along in your golf bag or pocket. It helps you accurately read the slope and grain of the putting green, allowing you to make more precise judgments on putting direction and speed. It is a practical on-course accessory suitable for all golf practice, casual games and professional tournament scenarios, improving your putting performance effectively.