PolyCheck asset labels are made of polyester and have a mirror-finished chrome security seal with a permanent acrylic adhesive applied, so in case of an attempt, it leaves a checkerboard pattern behind and on the surface of the tamper-evident label even if the label is stick back exactly where it was. This type of material may not be suitable for low-grade plastics, but it is perfectly applicable on bare metal, painted metal or other clean smooth surfaces on which they will last for years. PolyCheck can not have a barcode on them. This is due to the high-reflective surface of the material. Blue, red and black colors can be printed on this material.