Those are Kids only lanyards. Only kids can trade off of them. I think it is a good idea, then those folks that clear off the lanyards for all the "good stuff" can't get at those, and the kids can have a good time.
We are thinking about going to WDW this spring after seeing the great rates for the resorts. My son is wondering what is the age limit for the green lanyards at WDW. He has traded off the green lanyards at DL where the age limit is 12. Is it the same at WDW? I hope someone here can help me out. Thanks.