These 1/2″ square, brown, medium, Cratex sticks consist of tough, resilient, rubberized abrasive utilizing approx. 90 grit silicon carbide as the abrasive grain in a premium grade, oil-resistant chemical rubber. These sticks can be used manually or mechanically as they can be mounted in tool holding fixtures, chucks or cradles.  The unique cushioned action of the Cratex material allows the abrasive grains to cut freely, smoothly and softly without gouging or digging into the work surface. Ideal for work on jewelry, plastic parts, small castings and models. Cratex sticks are sold individually.  Measure 6″ long.  Made in Mexico.