I bought these because my 14 month son managed to break every other toy car I bought him within a week by leaning on them while pushing them around the living room. I was starting to get annoyed with the quality of toys available in the shops, but then remembered a brand name from my youth - Tonka. Although I was disappointed to discover the cars where not made completely of metal, I have been impressed with their ruggedness, and they have all managed to survive so far. The siren sounds are fun (and loud) which makes them double fun to play with. I even let my son play with them sometimes.