providing {HEAD ~ a first roller} adapted to receive the additive material within a plurality of spaced apart pockets located on {TAIL ~ its roll face} 
providing { HEAD ~ a first roller } adapted to receive the additive material within a plurality of spaced apart pockets located on { TAIL ~ its roll face }
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL