Engino Discovering STEM機械套件：槓桿、連桿與結構，建築玩具，9歲以上（可搭建16款模型）

The linkage models actually move the way they're supposed to, which surprised me after some flimsy building kits we've tried. My son built the seesaw first and spent an hour just testing how the lever arm changes with weight. Sixteen models means this thing will keep him busy for weeks.

Bought this for my 9-year-old and he knocked out the first- and second-class lever models in one afternoon without any help from me. The instruction booklet actually explains the physics behind each build instead of just showing pictures, which I appreciate. Sixteen models means it'll keep him busy

The linkage pieces snap together tight enough that the models don't wobble, which surprised me since I've had other building sets fall apart mid-play. My son worked through the lever models in one afternoon and kept explaining fulcrums to me at dinner.