Type BK: Plain paper, This is high-class paper of fine quality. It is used for various uses, such as a color illustration, 40 sheets.

Type-BK is a "Kent" paper version of Type-B plain paper. 
"Kent" paper is slightly more smoother than regular Type-B.
Has "Kent" paper's characteristic "blue-ish white" color.  

Availalbe in size A4 and B4, thickness of 110kg and 135kg.