It is QR Code cufflinks. Even the casual technology buff will find these QR Code Cufflinks to be a perfect accessory. Quick Response Code is a two-dimensional bar code that allows contents to be decoded at very high rates of speed. Just take a picture of a two-dimensional object on your cell phone, and additional information will be pushed through directly to your fingertips. With their symmetrical design and black and white finish, these QR Code cufflinks bring cutting-edge technology to the cuff of your sleeve. Cufflinks by Cufflinks, Inc. It approximately measured 3/4" by 3/4" in dimension. It is rhodium plated base metal and enamel and it will come Bullet back closure.