On metal NFC tags using the benefits of?

Normally NFC label or NFC sticker could be used on the metal surface. But we can add a ferrite in the middle of NFC stickers then we call on metal NFC tags.
E&R technologies supplies pre-print on metal NFC tags and blank ( no print). And there are many available sizes for customers’ choice. As usually, if you need to sticker on metal surface of your smart phone that the sizes usually not bigger than 50*50mm. And you can custom your own size for the anti metal NFC tags.
About the shape you can pick up square, rectangular or round or customized.

Application:
-Smart phone
-NFC payment
-Loyalty program
-E-ticket
Printing options:
-Offset printing
-Silk-screen printing
Key Feature :
-Dimension: 30*30mm, 35*35mm ;diameter:25mm/30mm with ferrite layer , or customized
-Thickness : 0.5mm to 1.0mm with anti-metal layer
-Glossy/Matt finished
-Bonding: FLIP chip
-Operate frequency: 13.56MHz HF
-Protocol: ISO14443A
- Chip available; MF S50/S70/Ultralight/Ultralight C/DESFire EV1 ,NTAG203/213/215/216 /Topaz
-Read range : 1-15mm ( depend on the reader power and the antenna size)
-Metal Environment: can be work directly on metal surface
-Working temperature:-25℃-+55℃
-Store temperature:-25℃+65℃
Related products: NFC sticker, RFID label, RFID library label, RFID tag with epoxy ect

http://www.nfcandrfid.com/products_info/On-metal-NFC-tags-314530.html