These pretty and big sized Sticker are from Furniture Series ITOKI CREBIO. I don't know the exact purpose, maybe you could just stick them on your bought table? I'm still missing stickers from first season. Also have I seen Stickers in smaller size (105 mm). So it might be interessting finding more of them :)
Manufacturer: Itoki Crebio
Size: 220 mm (round)

 

SuperS Series

Sailor Moon Itoki Crebio Sticker
1
Sailor Moon Itoki Crebio Sticker
2

Stars Series

Sailor Moon Itoki Crebio Sticker
1
Sailor Moon Itoki Crebio Sticker
2