8519 Big Chill is one of the Ben 10 sets released in 2010, intended for ages 5-12. The pieces are green, black, and blue.
"In Ben 10 Alien Force, transforming into the intangible, ghost-like Big Chill gives Ben the ability to pass through objects, become invisible and drop the temperature to near absolute zero. Buildable by kids aged 5+. Based on popular Ben 10 Alien Force story where 15-year old Ben Tennyson discovers 10 different alien heroes on the omnitrix."
Although it is said the body part is only one piece, the body consists out of two pre-built pieces which can be separated.
This set contains three unique parts : the wings, the chest plate, and the head.
This is a description taken from LEGO.com. Do not modify it.
That's no frozen phantom -- it's Big Chill!
It's hero time! When he transforms into the ghost-like Big Chill, Ben gains the ability to pass through solid objects, turn invisible and drop the temperature around him to near absolute zero. No bad guys can escape this cool and creepy alien hero! Features glow-in-the-dark eyes and Omnitrix chest symbol. Collect all 6 LEGO Ben 10 Alien Force sets and combine them to create your own super alien heroes! Features an omnitrix chest symbol and glow-in-the-dark eyes Measures over 8" (22cm) tall Collect all 6 LEGO Ben 10 Alien Force sets!