Tactical Full Titanium Alloy Folding Fan Martial Arts Portable Kung Fu Fan Tools. Titanium alloy folding fan metal steel bone martial arts portable kung fu folding fan. Reminder: The following is the sample size (approximate value) measured by hand, and there may be some errors in the measurement. Also, since the resolution of a computer monitor is different from that of light, it may produce different colors than real life. Please refer to the actual product.