Rfid Anti-Skimming Card in Bamboo Case. by Using an Electromagnetic Field It Makes All 13.56 Mhz Cards (Trains, Buses, Bank or Credit Cards) Secure From Electronic Pick Pocketing 2-3 Cm Around the Card. (1,3 Mm). Bamboo is a Natural Product, There May be Slight Variations in Colour & Size Per Item, Which Can Affect the Final Decoration Outcome. Minimum Quantities Apply.