When I bought my new bike, I decided to pick up a Bell Key Cable Lock while I was at the store. Now some people have the idea that a bike lock is a theft preventer rather than a theft deterrent. A determined thief can break through any lock eventually if he has the right tools and opportunity. The Bell Key Cable Lock is a security level 3 theft deterrent, with security level 4 being the highest possible level of theft deterrent. I live in a low crime area and my bike is going to be locked in the garage most of the time, so I was content with that level. The five foot long cable is made of 8mm of steel, and then wrapped with Kevlar before being wrapped with vinyl. I've had work gloves made out of Kevlar before, and it's a very good material for preventing sharp objects from being able to cut or pierce through to the skin. The vinyl coating doesn't scratch my paint, and the five foot length is plenty to wrap around my front tire, bike frame and a tree, support post or bike stand.
The Bell Key Cable Lock came with three laser cut keys in the package, and I put one directly on my keychain with my housekey so I wouldn't lose it or forget it. The Bell Key Cable Lock also includes a carrying bracket that I could mount onto my bike, which I thought was kind of neat. I only wish that the carrying bracket had been positioned horizontally instead of vertically to make the Bell Key Cable Lock easier to snap in and out of there once I had mounted it on my seat post, but that's really just a small inconvenience. Overall, I'm satisfied with the Bell Key Cable Lock.