Ergonomically-designed pen is designed to deter theft, resist tampering, and stand up to daily abuse. Flexible 23" nylon-coated aircraft cable secures pen to base. Sturdy, aluminum base mounts easily with double-backed adhesive or with hidden screw. Unique locking feature discourages dismantling, yet easily unlocks to change refill. Pen uses MMF Industries Jumbo Jogger refills.