McFarlane Toys/Odd Pods Series 1
From Halopedia, the Halo wiki
The Halo Odd Pods Series 1 is the first series in McFarlane's Odd Pods. They featured four different figures; two from Halo 3 Matchmaking and the other two from campaign. Odd Pods can be popped apart to have interchangeable heads, torsos and arms for countless customization possibilities, similar to how action figures have interchangeable armor.