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