The Puky learner bike was delivered quickly and is largely pre-assembled. You need a 5mm Allen key to assemble the handlebars and the saddle. Both can be adjusted in height and must be fixed safely to the solid clamps. The overall workmanship is very good, without any sharp points. An improvement would be desirable for the black cap that is intended to cover the clamp of the steering wheel. She sits very shaky and rattles.