There is also an O-ring to seal the cap and keep the contents protected.
The hardware is chrome plated.
The inside of the tube is nearly a 1/2″ diameter, the length is just over 1-3/4″.
This is shorter than my other secret compartment keychains but has a larger diameter hole to access the contents.
The tube portion, including ends is approx. 2″.
Overall length, including the ring is approx. 3-1/4″.