EM strip ( one/ two ¿Cside strip), compatible with all EM system, such as 3M ,Dialoc ,checkpoint,Kejingí»s. Cobalt-based, adopt super-thin demagnetizing slice. Good effect of re/demagnetizing. The material of strip all passed the authorization of SGS Testing Group, safe to human body. The length of inner: 5, 6, 8, 10, 12, 16cm 15000pcs/1kg