Master USA Kubaton Key Chain Knife - 7" overall - Academy Of Karate - Martial Arts Supply Inc.
Amazon.com: GOOD WORKER Hidden Knife - 5.5" Kubaton - Small Black Secret Knife - Japanese Utility - Sharp Concealed Knives - Letter and Envelope Opener - Pocket Knife for Men and Women -
Kubotan Keychain with Hidden Knife Self Defense Option Women and Men – SDP Inc