This knife has a coil spring which has a longer life and a smoother action. A stop pin keeps the blade from ever meeting the locking bar which allows for a wider blade. The liner, bolster, caps and the shield are 400 series stainless steel. The flat ground swedged clip point blade is 3 3/8”. The knife measures 4 1/2” when closed. It weighs 4.7 oz. This knife is NWT. It comes from a pet and smoke free home. It will arrive in its original packaging.