Be very aware of the following:
Even though these are one of a very few sets of roller skates that go up to a size 13, they're only for kids that weigh less than 20kg. This is in extremely small writing on the back of the package, and I'm pretty sure it didn't say anything about that on the advert. Most kids (especially girls seeing as they're pink with Dora on them) will be over the weight limit when they get up to size 13, you would think that they could have made them a bit sturdier and able to take an extra 5kg or so.
Considering we bought these for our 5-year old, who, although tall for her age, is pretty trim, she's 4kg over the suggested weight limit. doesn't sound like a lot, but 4kg of 20kg is 20% - we were not going to risk her hurting herself because they broke not being able to take her weight.
We also bought these for christmas, so you can imagine her dissappointment receiving these, but not being able to play with them.
Luckily, we have a second daughter who can put them to use when she's about 4 or so, so we won't be returning them, but still...