Designed for outstide use, the TAGnology PA6-TAG-34 will withstand high impact even at very low temperatures.  The PA6-TAG-34, EM4102 has a diameter of 34mm and is 8mm thick which makes it suitable for applications on metal.
 

Another advantage for some applications is the specific profile on the back side which has been created to improve adhesion when fixed with glue. 

Features
- Dimensions: Ø34 x 8mm
- Central Hole Ø5.4mm
- Material: modified high impact thermoplastic
- Storage temperature: -40 to +100°C
- chip type: EM4102 Unique

Datasheet