This is a set of "Wheelie" brand Tazos. They look like some kind of metal disks, with a small hole at the top of each one. They have rims, & colorful Sonic X themed art. You can see Tails, Sonic, Knuckles & Amy on the individual ones, plus most of the good guys of Sonic X plus Chris on the group one. The backs say "Jetix Wheelies Plus" Jetix was what distributed Sonic X in Europe usually. These are from the Netherlands, and are meant to decorate your bike wheels. The hole is where the spoke goes. It makes sense that they're metal, as bikes are sort of rough/outdoor items. However, using them would probably be bad for them if they got wet/worn/etc. This is an item better left unused. Added info by HoggerTheHedgehog
The Netherlands appeared to be on a roll with wheelies...
As, here come more and this time they are orange and pretty large. Notice the size of the hand in the right part of the photo. These are meant to be placed on the spokes of your bike wheels to help decorate it. (A good choice as bikes are very popular there) These were put out partially by Jetix which handled the EU area release of X. They are from may and june in 2009, so quite a short run.
Especially when you consider what you had to do to get them. In the grocery store you had to spend 15 euros, and then you would get a random one for free. With all the different designs and the short run of them, that probably wouldn't have been easy to do. So, these may end up uncommon. (Plus, that looks like sticker, and bikes could get rained on which is not a good combination either)
