Although the OTF-2 (Version 2.0) is the largest of our out-the-front knives, it is still very lightweight (just 2.9 ounces) and very comfortable to carry.  At the same time, the anodized aluminum handle and D2 tool steel blade provide a solid and sturdy feel.  When you slide the switch forward, the blade deploys instantly.  Slide the switch back, and it retracts just a quickly.  Be warned, this knife is very addictive.