This listing is for 1 set of cute "Happy Day" writing paper 

with non-gummed matching envelopes.

Each set contains 10 sheets and 5 envelopes with decorative and colourful lined designs on the front and plain on the back, plus a small sticker strip. 

The size of the sheets are 10mm  140mm, 

which is just a little smaller than A5, 

and the colourful envelopes are 255mm x 92mm.