It is approximately the size of a baseball and it is usually made of terra cotta. The grenade had a rubber plug covering the simplistic match-type fuze. It was ignited much like a flare. The grenade detonated after four or five seconds from ignition.
The Type 4 Grenade was developed because of the shortage of many raw materials, particularly because of Allied bombing raids. Terra Cotta could be mass-produced and the grenade was produced in the thousands. It saw usage on the islands of Iwo Jima, Okinawa, and Leyte in the Philippines.
- ↑ http://www.inert-ord.net/jap02h/grenades/t4/index.html
- ↑ http://afghanistansquid.blogspot.com/2011/09/strange-weapons-type-4-ceramic-grenade.html