... 7", 8",10",14",20", 25", 28" inch rice rubber roller 2. Cast Iron Drum,Aluminium Drum 3. Got ISO9001-2008 ... shelling efficiency up to 95%;The SBR and NBR rice huller rubber roller can be options.Elastic stiffness, ... up by two rubber rollers, in the end, rice grains come out.NBR roller is the 2nd generation ... of rice huller rubber roller, is adopted 100% NBR rubber ...