The 3i-1711-6HS features a closed cell foam interior that has been form cut to fit the Line 6 Helix Stadium Amp Modeler/FX Processer. The case interior includes an open cross space below the unit that measures 6.5” x 3.5” x 3” in front (by latches), 16.75" x 4.25” x 2.25” in the middle and 6.5” x 3.5” x 2.25” in the back (near hinges), which is perfect for the power supply, cables, and other accessories.