Made using the worlds' most advanced inorganic natural compound – AgION Antimicrobial, the necklace pen prevents the growth & migration of damaging bacteria, yeasts, molds & fungi on a product's surface. Unique design keeps pen handy either by clipping to pocket or hanging around neck. Easy-release clip keeps pen handy when job requires constant movement. Cord has quick release, snap-apart safety feature. Ink is high-density, acid-free & water-resistant.