THIS LISTING:  Numbered Silver Hexagon Security Valid Authentic Genuine Hologram Security Labels - 100 to 1000 Label Tamper Evident Labels. 

Each label measures 5/8" x 3/4" and are made of 2 mil P.E.T. metalized silver.  These are pre-numbered with unique numbering to further protect your product, no number will ever be repeated.  These cannot be customized.

These are tamper evident which means if you remove the label it will leave a pattern of dots on your product and cannot be reused.  The hologram is visible as light refracts through the hologram with movement - it will go through a rainbow of color.

These come on a silicone coated paper liner.  If your product contains silicone or has a silicone liner (some plastics), they will not work for you.  They work best on flat, smooth, non-porous surfaces.