This is a Letter writing set "Pressed flowers" by Tegamiya (matsumi yoshimura), who designs stationery in Japan.
Tegamiya is the artist who inspired me to start my own store, and I started this store because I wanted to sell her products.

Letterhead: 15 x 21 cm
Envelopes: 17 x 9.5 cm
2 sheets each of 4 patterns of letterheads, 3 envelopes, 8 stickers