Temple Audio Trio 21TRIO 21 The Temple TRIO 21 is a revamp of our classic Temple T21 boards. It is a common size choice for lead guitarists requiring more space for variety. With enough surface area to go three pedals deep, you've got plenty of room to mount a bypass looper while still having access to all your effect parameters. All TRIO series pedalboards feature one (1) micro module slot and three (3) mini module slots per side. specs: Size: 16. 5in x 21. 0in Dry