Porelon Fingerprint PadPermanent ink Lightweight, only 3. 7 oz. Temperature use: 32 degrees F to 150 degrees F Lifetime molded case Multi mount, injection molded, copolymer, polyproylene case Quick, easy cleanup Thousands of single impressions This pocket sized pad, introduced by Sirchie more than 20 years 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