Although it's a compatible product, the quality is quite good. Cheap ones often have plastic at the base where the band connects to the main body, which breaks easily. In the worst cases, the broken plastic remains stuck in the main body, causing problems. However, this one has a metal base just like the original, and it clicks into place securely. The silicone treatment is also of very high quality compared to others. I have several in stock as spares, so I'm offering some. If you need more than one, please comment. Price is firm for single items. 2-piece set: 1300 yen 3-piece set: 1800 yen 4-piece set: 2400 yen More than 4: please inquire Compatible with band8, band9, and band10.