The Protech TR-4 is the newest release of Tactical Response Automatic Knives from Protech Knives, an industry leader in autos. The TR-4 features an upgraded sliding safety on the front of the handle so there are no accidental deployments. Immediately when you push the button you can feel the torque you come to expect from a Protech automatic, hard firing! The Protech TR4 has a black handle made from 6061 T6 anodized aluminum with finger curves for superior ergonomics. The end of the handle features a lanyard loop and a glass breaker for emergency situations. The black pocket clip is tip up carry. The 4"black DLC coated blade is made from D2 stainless steel. The Protech TR-4 comes with a black nylon sheath for easy carry. If you are in the market for an auto and one that will bail you out of the most serious of situations then the Protech TR4 is all you. This knife fires very hard and it locks up very solid. As with all Protech knives you don't have to worry about them letting you down, another great job guys!