Pocket size - Lansky Sharpeners BladeMedic Knife Sharpener - 4 Sharpeners in One

As another reviewer said each part works as it is supposed to. The sharpener body is made of steel itself so I believe it will hold up well. the diamond rod is secured when closed or when opened with a strong magnet so it is easier to use and store, very nice feature i think. The magnet is nice also because it keeps the rod from opening in your pocket. It is small and therefore you need to be extra careful when using it, but it is meant to be small to fit in your pocket. I think it is perfect size and weight to carry on a hike or throw in your daily carry bag. I have only had the sharpener for a few days so I will update this review if need be. It also comes with well written instructions with pictures on how to sharpen your knife. It also shows how to use the sharpener in the correct order. All in all if you keep in mind this is more of a blade maintenance tool for the field that also has the ability to repair a blade edge you will be very satisfied. For the money you can not go wrong.