Specification: Brand new Material: Foam Color: gray, black, green, blue, redInner Diameter: approx. 4.9mm Outside Diameter: approx. 12mm (medium) Feature: Made of memory foam, eliminating in-ear irritation and fatigue. Sound isolating design can maximize the noise reduction for high-intensity listening. Comfortable to wear. Convenient to use and carry. Durable and practical. Package included: 5 pairs x Earbud Tips Note: Please allow a little size errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.