Wholesale Grav Labs 7" Sip Series Bubbler - Coffee Mug Start your day right with a cup of GRAV. This familiar design conceals a really effective bubbler. The perc and smoke pathway are built into the mug's handle. Great hand-feel and an ample bubbler chamber combine to make the GRAV Coffee Mug one of the most pleasant smoking experiences in a long time. Features Part of the new GRAV sip series Stands 4" tall at the top of the mug, 7" tall at the top of the straw 14mm female joint Comes with a 14mm cup bowl Features a fixed fission downstem