Horizontech Falcon Bubble Pyrex Glass Horizontech Falcon Bubble Glass. this is a replacement Pyrex glass that is used to increase the capacity of the Horizontech Falcon Tanks. Increase the capacity of your tank to 5ml. Can used with standard Falcon tanks, Resin Falcon Tanks, Artisan Falcon Tanks, and with the Falcon King Tanks. This Glass will not fit the Falcon mini tanks. Contents: 1 x Genuine Horizontech Falcon Bubble Glass 1 x Spare O-Ring Set Features: Tank capacity: 5ml Made from toughened Pyrex glass