This is a 5 Loooper with Tuner Mute and Master Bypass, in the "RB" enclosure.  This enclosure is made from high-quality extruded aluminum.  It can vary in length according to need.  This unit measures 16" x 4 3/16" x 2 5/8" inches or 30.5 x 10.5 x 6.5 cm.