The MJ arsenal line of mini rigs are designed with one simple philosophy in mind. Less air, equals more flavor. The Hydra Mini Rig comes with a 10mm male banger nail, and all these pieces are made from quality borosilicate glass. The MJ arsenal even went so far as to give filling directions on the package, to ensure you get the most out of these sleek little pieces. All MJ arsenal mini rigs ensure you'll get all the flavor out of your favored concentrates.