3.5" Frit Spoon Hand Pipe with 3 Marble Knockers on Bowl . These are almost 4" length . The Triple Knocker Frit Mouth Hand Pipe uses a trio of glass knockers positioned at the bowl to contribute to its playful aesthetic. Colorful glass fritting at the mouth of the smoking pipe further reinforces a festive feeling. This glass pipe relies on the classic spoon shape for comfortable, easy handling and a reliable grip. The almost 4" length is also perfect for discrete smoking, leaving the pipe easy to conceal and highly portable. This hand pipe is created from top quality borosilicate for heavy use.