first off if your looking for a bubble mower then look else where but if you want a mower that runs over every surface with just the right amount of balance on the front and the back then you found the one your looking for. Grass,thick carpet or gravel this mower plowed over all of it!!! The mower is sturdy and made a hard bright colored plastic, it makes a great mower sound when push and best of all requires no power source to produce the sound. If your wonder about the bubble portion of the mower then read all the other reviews, i've yet to use the bubble portion of this product and to be honest i have no plans to in the near future.