These are the side snap training aids, another magnetic training aid coming soon from @redstickgolf . They are designed to connect to the side of your putter giving you an extra alignment aid when practicing . Not all putters are magnetic so they come with a steel sticker that you can apply to the side of your putter and then the magnet In the side snaps will stick on to that . It does depend on the type of putter that you have as to how effective these will be as you can see with this @spoilerg