Japanese Choji Oil Choji Oil has been used by generations of Japanese sword smiths and wood workers to protect their tools from rust and corrosion. Choji is non-toxic and not greasy, and aside from being a great means of preservation it's also perfect for restoring the appearance of your Bonsai tools and pots. 1oz of 100% Organic Japanese Choji Oil straight from Japan Directions: Simply wipe on and buff with a lint free cloth to restore the luster to weathered pots and Bonsai tools. Direct from BonsaiOutlet.com, the Internet's largest Bonsai retailer, Money-Back Satisfaction Guarantee.