38 x 28 mm Clear Perforated Shrink Band for Small Boston Round Bottles, Vials, Dropper Bottles, Roll-On Bottles and More. [Compatible Diameter Range: 1/2" &ndash; 7/8&rdquo;] - Bundle of 500 Shrink bands provide a professional look to your products while simultaneously offering a tamper evident safety seal. Not only is a tamper evident seal required in most cases, but it also gives your customers confidence that your product is safe for use. Layflat dimensions: 38 mm x 28 mm (1.49 in x 1.1 in) Works best for lids with a diameter between 1/2" - 7/8" 2 Mil Perforated Clear PVC Plastic Examples of products this works best with: Small boston round bottles, vials, dropper bottles, roll-on bottles and more. As there are many different types and sizes of containers, it is best to measure your specific diameter to ensure you purchase the correct size!