This great wearable brass teleidoscope is 3 inches tall and 3/4" in diameter. The exterior is made of solid brass or chrome and is lacquer finished for easy care. Comes with a 30 inch total length satin ribbon. We can help you pick out an appropriate color ribbon--please ask for the color in the comments section of the order form. This necklace is a Teleidoscope takes whatever you point the end at and makes a kaleidoscopic image of it. The images here were taken pointing at a colorful webpage.