Spyderco UK Pen Knife. 4 1/8 closed non-locking folder. CPM-S30V stainless drop point blade with thumb hole. The blade is held open by a notched-joint at the knife's pivot. When closing the blade the notch produces roughly twenty-pounds of resistance, functionally similar to traditional slip-joint pen knives. Developed for the UK market where there are strict restrictions about blade locking mechanisms. Foliage green G-10 handles. Stainless pocket clip."