LI-3 Fingerprint pad. 4in x 2-1/2in. 14,500 imprints per pad. Prints will not smear and are instantly permanent. Leaves little to no ink residue on fingers. Specially formulated ink pad does not dry out if pad is left open. 2-sided tape on bottom of pad enables pad to be mounted to counter or desk. Use disposable towelette to eliminate any residue from fingers