In use, the block may be made to form vertical or set back walls without {TAIL ~ pins} or other securing mechanisms as a result of the high mass per {HEAD ~ front surface} square foot 
In use , the block may be made to form vertical or set back walls without { TAIL ~ pins } or other securing mechanisms as a result of the high mass per { HEAD ~ front surface } square foot
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH