P405261 Prym Collar Ribs. These transparent, plastic stiffeners are a practical aid for smooth and perfect-standing shirt collars. Premium shirts and blouses are mostly equipped with an extra, small insertion opening for it. The stiffener is simply inserted there. The stiffeners can be removed just as easily to clean the shirt. They are available in sizes 10 x 55 mm and 15 x 80 mm in cards with 24 units each. 405261 plastic 10 55 mm transparent 24pc