NOC is divided into 4 versions, the design style is simple and elegant. The V1 has a red blue green yellow and purple 5 colors, no mark system, is currently out of print! V2 except the color more light blue, orange and Black Edition, white edge is more narrow than V1 and have their own unique set of sign system. V3 version for the Taiwan Legend company, brand quality is also good, but not less than USPC production smooth, is currently scarce. V4 NOC is also produced in Taiwan, with respect to the V3 version of a similar stamp seal.