Adafruit Industries Magnets - Multi Purpose 9 are perfect for a variety of applications. These magnets are 0.5" in diameter and 0.197" in height, making them ideal for small projects. They are made of a strong neodymium material, making them incredibly powerful and reliable. They are perfect for holding items in place, such as paper, photos, and other lightweight objects. They are also great for use in DIY projects, such as creating magnetic boards or attaching items to metal surfaces. With their small size and powerful hold, these magnets are sure to be a great addition to any project.