RF chip: NTAG213, NTAG216, M1 S50, etc. RF frequency: 13.56MHz Communication protocol: ISO 14443 typeA Sensing distance: 1~8 cm Material: ABS, PVC, Epoxy Dimensions: φ25mm, φ28mm, φ30mm, φ35mm, φ42mm, 35× 35mm, 20× 30mm, 22× 45mm, 54×85.5mm, ug uban pa, can be customized Shape: round, square, rectangular, ellipse, irregular shape, cartoon shape, etc. can be customized Production process: four-color printing, sutla nga sutla, surface printing number, LOGO, …