Text and picture copied from "Japanese Infantry Weapons" cincpac cincpoa Bulletin 55-45, 15 March 1945 :

"A frangible grenade or Molotov cocktail used by the Japs consists of a bottle filled with a gasoline-base inflammable to which a glass cup containing red phosphorous is added. The device is 9½ inches high, 2½ inches in diameter and weighs 1½ lbs.
To operate as a hand grenade, throw the bottle at a tank or pillbox in such manner that the cup containing the phosphorous strikes first. When the cup and the bottle break, the phosphorous ignites the gasoline".

Another glass smoke grenade shows below.

Length: 83mm , diameter: 66mm.
Weight: 275gram including 116gram titanium tetrachloride.