Shun Ken Onion 7-Inch Cleaver. Shun Ken Onion knives combine this handsome, nonstick blade with a Ken Onion signature ergonomic handle design and the unique blade sweep found only in Shun Ken Onion knives. Shun Knives are dishwasher safe, however, as with any lifetime investment, it's important to take the best care possible in order to prolong the life of your knife. For multiple reasons, Shun does not advise putting knives in the dishwasher. Hand-washing is recommended. Limited lifetime warranty.