Proximity Card: credit card size & thickness, TK4100/EM4100,4102,125KHZ , 64k byte read only, read rang:2-10cm. Product Description:125KHz proximity card is a great solution for access control and time attendance system, which do not require very high security level. We supply blank and pre-printed cards.Features:Dimensions: 86 x 54mmThickness: 0.84mm(Clamshell card is 1.8mm)Material: PVC, PET, ...