This pocket-sized pad, introduced by SIRCHIE more than 20years ago, is the accepted STANDARD by law enforcement world wide. Each pad may be used to record thousands of fingerprints. A two-year supply of ink is impregnated in each pad (based on 75 F with lid closed after use), and is excellent for use in the field or office.The thermal-impregnated fingerprint ink is non-fading and dries on-contact in seconds. Ink rises to the surface as required through capillary action of the micro reticulated thermoplastic resin. Recorded fingerprints from this pad are accepted by state and federal agencies. The Porelon Pad utilizes the multi-mount injection molded case for versatility in mounting options.