Various scissor embodiments feature channel voids or passages defined within the inside surfaces of scissor blades or shaft sections. The channel voids or passages allow foreign matter to be self-expelled by the movement of the scissor blades. Disclosed blades or shafts are pivotally connected by a new connection assembly that expels foreign matter during the normal use of the scissors. Disclosed embodiments include scissors comprising: a pair of blades (1A, 1B) overlapping each other and a shaft (3) inserted through a shaft support hole (2) in the blades (1A, 1B) and having a tip (4) that is bucked to allow the blades (1A, 1B) to pivot in an abutting state, a passage communicating with the outside to allow inflow and outflow of water, etc. is formed between abutting faces (5) of both blades (1A, 1B) and between the shaft (3) and the shaft support holes (2).
