The wheels on my daughter's scooter were really worn on one side I guess she leans more to one side than the other and they weren't spinning well.  She had to push more often than if she rode her sister's scooter and she is younger she was having a harder time riding her scooter.  I looked at couple different retail stores and had a hard time finding these wheels in pink.  When I did they were more expensive so I was happy to find them here on Amazon they were around $20.  They arrived quickly and my husband didn't have any issues switching out her old wheels and putting these ones on.  Wow, they made such a difference for her riding her scooter.  It was a much smoother rider and each push of her foot allowed her to go further than when her worn old wheels were on her scooter.  It was almost like she got a brand new scooter again because it rode so smoothly.  The scooter's hold up really well so it saved us having to buy a new scooter and just being able to replace the wheels.  Our daughter is happy and it was such an easy fix.