材质：PP、ABS。尺寸：34cm，内含3支密封透视管，清晰的透视管让幼儿们能清楚观察摩擦力、流量和速度。幼儿通过翻转透视管学会角度决定球的速度和漏斗的流量。
Our clear-view tubes are a fascinating way for kids to get hands-on experience with friction, flow and speed! Each tube is designed to showcase a different aspect of motion—children simply flip the tubes and watch as the angle of a track determines the speed of the balls, the size of a funnel controls flow…and the smoothness of the tracks controls how fast or slow the balls move! You get a set of 3 permanently sealed tubes; each measures 13 1/2".
