This kit contains VEX IQ Gears, rack gears, worm gears and linear slides.

Features
(10) 12 Tooth Gear
(10) 36 Tooth Gear
(6) 60 Tooth Gear
(4) 36 Tooth Crown Gear
(8) Rack Gear
(4) Linear Slider
(2) Worm Gear
(6) Worm Gear Bracket