This is a Letter writing set "Flower vase" by Tegamiya (matsumi yoshimura), who designs stationery in Japan.
The flowers in the small vase are very, very cute in this letter set.
The letterhead is half the size of a B5 and is a light cream color, The paper is smooth to the touch.
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: 8 sheets, approx. 9.1 x 12.8 cm
Envelopes: 3 sheets, approx. 17 x 9.5 cm
Stickers: 3 sheets