Auralex S-MLENCHA Stand-Mounted LENRD Bass Traps in Charcoal: 4- 12x12x17 Triangular; 48 Long with 4- Stands Stand-mounted LENRDs are the perfect complement to our MAX-Wall Modular Acoustical Environment! They're portable, effective, great looking and highly affordable. Not only that, but because they're stand-mounted, there's no adhesive to worry about and no wall repair to do if you move and take your Auralex treatments with you