Detailed Product Description Keychains (KCAB01)Customization option: Silk-Screen Printing Jet Printing Serial Number Laser Mark Serial NumberPhysical Specification Dimensions:40.5X32X4.2 mmWeight per card:7 grammMaterial:ABSColor:blue,yellow, grey,black,white etcStorage temp: -25oC to 50oC Application temp.: -25oC to 50oC Chip name: EM4100, EM4102, TK4100, T5567, Mifare 1k, ICODE SLI etc.