The high-temperature-resistant silicon prevents spilling your ashes when you bang your expensive glass pipe or slide against the rubber "Smash" pillar. Most ashtrays are made of glass and will cause your pipe to break if you bang it too hard when trying to clean it out. The stainless steel ash catcher is easy to clean and will last a lifetime. You can remove the silicone top for easy cleaning. Measures approximately 4" diameter. Perfect for outside cashing or dark porches, the glow in the dark kind ash provides functionality even at the dead of night!