Four (4) Pack of Wonder Button Silver Metal Professional Shirt Collar Extender Packaging May Vary . Pack of 4 Silver Metal Professional Shirt Collar Extender Get a 1/2-size of extra room, or daisy chain 2 or 3 together for a full size of extra comfort Discreet and disappears completely under any neck tie. Removable expanders - they simply loop around your shirt's existing button, no sewing required! Packaging May Vary but the Product is made by Schafer Products