Phoenix Star 6.9 Inches Freezable Dab Rig with Showerhead Perc PHX563, a small size rig, comes with a conical shape design which is very stable. This popular dab rig is made from durable borosilicate glass, features a showerhead perc on the bottom chamber for a smoother hits. The oil rig is filled with glycerin, so you can put it in your freezer for 1-2 hours before dabbing. Standing at 6.9 inches in height and 5mm thick, this dab rig has a ideal size for travel or on the go.