Qline Tamper Evident Envelopes have a higher level of tamper evidence security features that provide an immediate irreversible sign that it has been tampered with.

They are made of Co-Extruded Polyethylene Films that are black on the inside and white on the outside or can be transparent, and they come with a hot melt adhesive strip for easy and permanent closure.

It has a specific security seal with vacant characters that indicates tampering. Once sealed, the envelope cannot be opened; the only way to open it is to rip or cut it. If somebody tries to tamper with the product, VOID letters will be transferred to the other side, indicating that it has been tampered with.