The menu item features crispy-fried chicken strips with a kick of heat. They were first introduced in April of last year.
To promote the return, the Spicy Chicken Strips will be featured in a limited-time 3-piece combo with small fries and a small drink with prices starting at $4.99 (may vary; $5.99 here in Southern California).
Based on my experience with these, they're not just spicy versions of the chain's regular chicken strips as they were noticeably bigger with a different breading and in addition to a substantial amount of spicy heat were seasoned more heavily in general.
Photo via Jack in the Box.