The keychain says it all, you're a Whovian.
Keychain is double-sided with the same artwork on both sides. It's made of fiberglass reinforced plastic (FRP), which is super strong and won't break. The artwork is dye sublimated, which is a process where the ink becomes part of the plastic. This process makes it so that the artwork doesn't scratch off, peel, or fade.
Keychain is 3" long, 1 1/4" wide, and 1/16" deep (7.62x3.175x.16 cm). Artwork is blue burst background, with rainbow text mimicking the 4th Doctor's logo. Metal ring is silver-tone, attached with a snap-plastic closure. Key pictured for size comparison in 2nd picture, and not included with purchase.
Original design is ©Nani?Wear 2010.