Japanese Samurai Katana Sword Maintenance Cleaning Kit with Blade Oil & Hammer Full sword maintenance kit. Includes: Brass Mini-Hammer, Sword Oil, Uchiko ball, and Cotton Cloth. This kit is a Must Have for all serious sword collectors. Includes instructions for sword care. Comes in wooden box. This kit is A Must Have for all serious sword collectors.Why do you need to buy this cleaning kit? All metal parts of your sword should always be covered with a light coating of oil to prevent rust. DO NOT TOUCH THE BLADE BEFORE RE SHEATHING.