The Caldwell 1 in 6. A 6 inch blade with palm swell, micarta grip, no choil ,made in 1/4 inch CPM154 steel. I fitted my ESSE 6 Broom handle version over the top of this and the blade shape was almost the same. However the design captured both the ESSE 5 thickness with the ESSE 6 length making for the perfect combination. With the full height grind it actually feels lighter than the ESSE 5 and Becker BK2, even with the extra inch of steel at the tip. I usually recommend ESSE knives to people and had to put this one up to show what an ESSE with a 1/4 inch spine in a 6 inch blade would look like with 3D grips. I believe there were under 200 Caldwells made in this model.