Howard cards have been the premier source of wool cards for over 100 years. Used to bring out the wool fibers for showing and yarn making. Can be found in nearly every sheep show box in the country. The card number specifies the shape of the wire "teeth". Manufactured by Howard Made in the USA Howard cards have been the premier source of wool cards for over 100 years—and can be found in nearly every sheep show box in the country. Used to bring out the wool fibers for showing and yarn making. The card number specifies the shape of the wire "teeth".