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Build & Block
  • $17.99 $12.59
Gears! Gears! Gears! Machines In Motion
  • $39.99 $27.99
Stem Explorations: Gears Building Set
  • $14.99 $13.49
Stem Explorations: Levers & Pulleys Building Set
  • $14.99 $13.49
Cams & Cranks
  • $35.95 $25.17
Leonardo da Vinci - Catapult
  • $19.95 $13.97
Stem Explorations: Vehicles Building Set
  • $24.99 $22.49
Build 50 Models Motorized
  • $59.95 $41.97
Da Vinci - great kite
  • $19.95 $13.97
Da Vinci - mechanical butterfly
  • $19.95 $13.97
Da Vinci - Multiple Sling
  • $19.95 $13.97
Da Vinci - ship's cannon shield
  • $19.95 $13.97
Da Vinci - submarine
  • $19.95 $13.97
DaVinci Invention Land and Air Models
  • $122.69 $85.88
DaVinci Invention Sea Models
  • $61.35 $42.95
Exploring Wind & Water Energy
  • $79.99 $71.99
Gears & Worm Drives
  • $35.95 $25.17
GUMBALL MACHINE
  • $24.99 $17.49
Intro to Simple Machines Levers & Pulleys
  • $39.99 $35.99
K'Nex Intro To Simple Machines
  • $39.99 $35.99
K'Nex Intro To Simple Machines: Gears
  • $39.99 $35.99
Leonardo da Vinci - Aerial Screw
  • $19.95 $13.97
Leonardo da Vinci - Paddleboat
  • $19.95 $13.97
Leonardo da Vinci - Self-Propelled Cart
  • $19.95 $13.97