The ESEE-4 is one of the most popular ESEE knives ever made. With its 3/16a ^2 thickness, it's the perfect blend between toughness and cutting efficiency all in a small package. If you can only choose one, then the ESEE-4 is the do-all workhorse of the ESEE line.Stainless steel ESEE-4 knives are made from CPM S35VN. It should be noted that stainless steel is not as flexible as carbon steels. Any excessive flexing of the blade may cause breakage.As part of ESSE's continuing commitment to training and outdoor education, the box includes survival, navigation and emergency signaling information printed on the box sleeve. FeaturesCPM S35VN stainless steelBacked by ESEE's no questions asked warranty