A slipjoint knife is one of the most ubiquitous types of pocketknives. Some jurisdictions prohibit the possession or use of pocketknives that feature locking blades. Slipjoints tend to be smaller than other typical pocketknives. Most pocketknives for light duty are slipjoints. The earliest known pocketknives date to at least the early Iron Age. In the late 20th century lock-blade pocketknives were popularized and marketed on a wider scale. Higonokami pocketknives proved very successful and were very popular in Japan. Nowadays the pocketknives are produced primarily for tourists, but still of a very high quality.