I purchased a box of these tags to get started implementing an electronic article surveillance system at my wife's retail shop. I had already purchased and installed an older and refurbished set of Checkpoint antenna towers, and I purchased these tags to work with the towers. I'm starting off with one box to ensure they worked (which they do) with the towers, and then I will purchase more as the tags get used up and deployed on merchandise. Metal pins are included with the tags, so you can get started right away putting these tags on your merchandise to protect it. This is a great tag for DIY small business owners who are putting together their own RF security tagging system.