The Rush 290/291 from Buck knives incorporates an advanced design spring mechanism that provides easy, safe blade release in assisted-opening knives. The dual-spring blade pivot, coupled with a cam lock and blade-release ridge, create a smooth, safe, reliable blade opening in this liner-lock knife. The 2 1/2-inch drop-point blade is made of 420HC stainless-steel in the Model 290, with platinum or midnight blue handle; ATS-34 in the Model 291, with gun-metal gray handle. The skeleton frame handle is made of color-anodized 6061 T6 aluminum. With an overall length of 6 1/4 inches, the Rush knives weigh 2.4 ounces.