Hape quadrilla double-sided spiral twist marble track. 9 pcs.

Give the Quadrilla set a double spin with this fantastic double-sided spiral twister. Both the concave and convex sides feature spiral tracks, doubling the fun. Playing Tips: When the concave side of the spiral twister faces up, marbles roll from the arm into the outer ring and then quickly down to the center. With the convex side facing up, the marbles' rolling speed is reversed. A marble placed in the center rolls quickly from the center to the outer ring and the arm. Features • Double-sided Spiral Twister • Both sides of the twister can be used, doubling the fun • Marbles roll inward on the concave side and outward on the convex side • Set includes one double-sided Spiral Twister, three wooden distribution blocks, one gate plug, one accelerator, two stabilizer rings and two height adjusters, eight marbles • German-engineered design inspired by Da Vinci Circles • Helps develop spatial thinking and the basic principles of STEM (Science, Technology, Engineering and Mathematics) • Praised by The Wall Street Journal as the perfect toy to teach kids how to code • Compatible with all Hape Quadrilla sets • For ages 4-99