I love the pens but in practice and actual experience I prefer the above key chain is much better for control to the Pericardium and other key point including raking the eyes much better support for strait in striking. Being a Meat Chef when I say the beautiful piece of Beef being stabbed with the pens I could only foster up a vision of a scene from Oh Brother Where Art Thou ( Oh George not the live stock) when he was shoot cows with a Thompson Sub machine gune