Hubelino track: wipwapan filling set The seesaw is our biggest expansion part. If the marble has sufficient speed, the right will roll into the seesaw and then continue with increasing speed. And because you can never have enough seesaws, there are two of them in this set, along with track elements, building blocks, a base plate and marbles. Specifications: Color: multicolor Gender: junior Material: ABS Package dimensions: 28.4 x 14.6 x 11 cm (L x W x H) Suitable for children from 4 years. Content: 2 seesaw swaps 19 Track elements 20 Construction elements 2 marbles 2 Base plates