Very rare retro, low-smoke mosquito coil paper. There are 10 sheets. No tray included. These are no longer sold, so I think they are rare. They produce little smoke, and I used them when my children were infants. Now there are mosquito coils that don't produce smoke, but there weren't many back then, so I used these. Please consider this item, understanding that it is a used item that has been stored for a long time. Popular words... Showa retro, vintage, rare