Technical specification:
Chip type: EM4100, EM4102, T5557, MF1S50, S70, Ultralight, I-Code I, I-Code II
Dimensions (mm): 17×3.5, 22×2.4, 25×4, 30×3, 35×4
Color: optional
Material: ABS plastics
Examples:
Disk of ABS plastics. Can be used as a token.