What is this, a hand pipe for ants?! Just kidding, these are for anyone who appreciates the travel-size convenience of a miniature pipe. What is this, a hand pipe for ants?! Just kidding, these are for anyone who appreciates the travel-size convenience of a miniature pipe. The 2.5" Assorted Inside-Out Hand Pipe comes in a pack of two and is made of 100% borosilicate glass.