North Star 18" Porta Roller Slab Roller Mason Because it has such a

Because it has such a low iron content

The screen size is 12 1/2" H x 18" long

Because of the back pressure generated by a large amount of clay being forced through a small orifice

It has a more diversified selection of fluxes than other feldspars but also has one of the highest silica contents

North Star 18" Porta Roller Slab Roller Mason Because it has such aThe PortaRoller was designed for ceramic arts teachers who are moving from classroom to classroom and for studio potters who need a fully functional slab roller but have limited space. The PortaRoller has two rollers, much like the wringer of an old fashioned washing machine. Both rolls have a small diamond pattern ("knurling") machined directly into the metal to grip the canvas. The bottom roll is turned by the handle, but cannot move vertically. As