COPPER-NICKEL-ZINC ALLOY SPONGE INTENDED FOR USE IN CLEANING COOKING POTS AND PANS; SPONGE CONSIST OF NOT MORE THAN TWO CONTINUOUS SMOOTH EDGE RIBBONS CURLED UNDER TENSION IN AN UNBROKEN SERIES OF COILS FORMED IN AN INTERLOCKING SHAPE; THE RIBBON IS FROM 0.0014 TO 0.0024 AND 1-3/4 INCHES MINIMUM IN THICKNESS