50 x Disposable 180 Grit Zebra (Signature) Files Part of the Signature series of files and buffers made from Grade A Japanese raw materials using the most cutting edge Korean manufacturing process. Half Moon Steel Cores are sold Separately Made from the same highly durable material as the new Signature (Zebra) files the zebra replacements work in conjunction with the HM (half moon) Steel Core. This system will at some point in the future become the norm and will replace existing file systems. The disposable file system does not use a plastic core so the benefits for the environment are massive, the hygiene factor is also great should you replace the strip before each client. Each strip has a superb adhesive backing making it unbelievably easy to attach and remove.