The MJ Arsenal Houdini features powerful carbon filtration and smoke reclamation to discreetly eliminate odors from consumption with up to 200 exhales per filter. Compact, sleek and disposable, it's the perfect air filter for maintaining privacy while keeping your environment fresh and odor-free. Retail Unit: Single Unit. See Multipack (10 Pack) Here Dimensions: 3.6“ x 1.7” x 0.8" Packaging Size: 3.8" x 1.9“ x 1.0” Disposable Device Carbon Filtration Exhale Smoke through Houdini for odorless air Portable Easy-To-Use Approximately 200 uses (Performance varies by user, type of smoke)