Quantity   Component name
1 × Teensy 3.1 USB Development Board from PJRC.com
1 × Logitech Trackball Marble Mouse Victim pictured on page
100 × 40 Pin Single Row Female Headers Futurlec FHEADS40 – 40 Pin .100 $0.35ea
10 × 40 Pin Single Row Male Headers Futurlec HEADS40 – 40 Pin .100 $0.19ea
100 × 4 Pin Single Row Female Headers Futurlec FHEADS4 – 4 Pin .100 $0.08ea
100 × 2 Pin Single Row Female Headers Futurlec FHEADS2 – 2 Pin .100 $0.04ea
20 × Tactile Button Switch 6mm Adafruit Tactile Button switch (6mm) x 20 pack #367 $2.50
15 × Tactile Button Switch 12mm w/ color Key Caps Adafruit Colorful Square Tactile Button Switch 15 pack #1010 $5.95
40 × Female Jumper Wires 6" Adafruit Premium Female / Female Jumper Wires – 40x6” #266 $6.95