They're just plastic todler spoons you can probably buy anywhere. I bought them for my little niece but I never got to use them so two weeks ago I found them in the kitchen drawer and gave them to my birds and they both love them. It was a package with 3 spoons and all 3 are colored differently but Phoenix has a favorite, the red with orange spoon

They both allow me to lay them on their backs but they dont like it very much when I do it, so I didnt train them or anything, they just do it theirselfs

I think to me thats sort of a compliment because laying on your back on the floor is probably on of the most vunerable positions for a bird. To me that shows that they are very happy, comfortable and relaxed in the presence of me and their infiroment.