Shishito peppers are an East Asian variety. They are grown mostly for roasting / sauteing while still green. 

On the whole, this variety is classified as a sweet/mild pepper. However, occasionally and without warning a fairly spicy pod will show up. Shishito lovers embrace this characteristic, and would expect nothing less.

Plants average 2 foot tall, do exceedingly well in containers and are extremely prolific.
 
Sold in a 2.62" wide x 3.5" deep pot.