Security Chain Security Pen, 4 Pens, 1 Base, 5 refills, blueNadex Ball Chain Security Pen Set. Pack includes 4 Blue Security Pen with ball chain, 1 Base, and 5 refills.. Rubberized grip and ridges for proper feel and writing comfort. Rubber base with peel able sticky bottom for securing to many types of surfaces.. Security chain for attaching to base. Each pen has a small attached chain with link for quickly attaching and detaching for added convenience. Our pen also works works with many other security pen