It is a postcard with a synthesizer design in cool shades. It is a simple and impressive postcard made of colored paper. Uses paper that is a little thinner than government postcards. It's also perfect for gift messages. It is one piece that music lovers will involuntarily nimmari. It is a set of 4 pieces, so please use it according to your preference. <Synthesizer Postcard Product Details> Cool Tone Set Postcard white/grey/dark blue/red　 4 types 1 each 4 pieces set * All colors have the same design. <Synthesizer Postcard Specifications> Analog synthesizer type (32 keys) Shipping method: Standard mail / postcard / gift enclosed, etc. Size: 148×100mm (postcard size) * A little thinner than the government postcard * Dark blue and red are actually darker colors than the photo. * The color of the postcard may differ slightly from the one on the screen. Thank you for your understanding.