Pulsar 4:20 Time Piece Bubbler Pipe - 4.5"This 4: 20 Time Piece Bubbler Piper from Pulsar measures 4. 5 inches (11. 4cm) long and have the appearance of a clock face with hemp leaf hands that always point to 4: 20. Bubbler pipes can be a great crossover between traditional hand pipes and larger water pipes. Great for the casual or frequent smoker, bubblers require just a small amount of water and are just a bit larger than regular hand pipes with the added enjoyment of water filtration.