Here's a great idea that's sure to measure up for your next branded promotional or advertising campaign. This bulb-shaped 2 1/2" x 1 1/2" x 3/4" keychain is made of durable ABS plastic, and connected to a short chain with a split ring. Inside is a retractable 40" tape measure with US and metric markings that's perfect when you need to take a quick measurement on the fly