The nanoSTRIKER XL by Exotac is very compact, despite the addition of 'XL' to the name. It can easily be carried on your bunch of keys. Compared to the original Nanostriker, the handle is 46% larger, to make it more manageable. The scraper is made of tungsten carbide. This material is extremely hard, so that you never have to sharpen the scraper (with normal use). The magnesium Rod gives sparks of 3000 degrees Celsius, which burn extra long due to the addition of Ferro-cerium.
The screwparts are protected against moisture and other influences by the O-rings. Delivery includes an extra set of O-rings. Also the scraper and the swab can be replaced if needed. The container where you fit in the swab is made of anodized aluminum.