Barry King Swivel Knife - My friend got this in the US. Description: Includes a new, high-quality ceramic replacement blade (purchased for 4500 yen. Ceramic blades are less prone to chipping and maintain their sharpness for a long time. The harder the material, the stronger the edge retention and the less wear it experiences.) The blade width is 9mm. The blade thickness is 2.5mm, and the blade shaft handle diameter is 5.5mm, but there is also a steel tube that fits with the blade handle, so it can also be used with a Barry King with a 6.5mm inner diameter.