Dashing envelope. 

D-BROS Booooon!

D-BROS Booooon!

D-BROS Booooon! is a envelope.

Illustrations such as cars.

This is how to open it.

Car will start like boooooooon!

Top speed!

Three types of envelopes available, airplane, car, and locomotive.

You can buy it from this store.
ショッピングサイトで検索しました。
12 at random.