4x4 Trellis Acrylic Enclosure & Hardware Kit Adafruit 4x4 Trellis Acrylic Enclosure and Hardware Kit is a super-specifically laser-cut enclosure that includes acrylic cutouts and nylon spacers, nuts, and screws. This enclosure turns the 4x4 Trellis into a light/music maker. The 4x4 Trellis acrylic feather enclosure and hardware kit can be used as a MIDI instrument, an interface, or a control panel. This 4x4 Trellis acrylic feather enclosure and hardware kit come in 86mm x 86mm x 31mm dimensions.