These golf ball position markers are made of durable plastic, with a flat design that won't interfere with your putting. Each marker measures 0.94 inch, same size as a quarter, perfect for easy placement and identification on the green. You can choose from 50 pieces or 100 pieces sets, coming in mixed bright colors for clear visibility on any grass. They are designed to mark the exact position of your golf ball on golf courses, helping you follow golf rules correctly when lifting your ball to clean it. Ideal for daily golf practice, casual games and formal golf courses use.