I don't have the toy in front of me, but my recollection puts diecast in the chest, thighs, parts of the arms and back half of the legs (they split). I think they did the back half because the front half has a lot of opening panels which would be harder to do in diecast. The joints are also diecast, those being the elbows, hips, knees and the swing-bar that positions the torso from cruiser to walker mode. I think part of the mid-section is diecast, too. The thing is HEAVY. It feels very substantial in your hands. It's also notable that it is SOLID. Sometimes toys this heavy can get a little unstable or wobbly under their own weight, but not IG. Like I said before, it's a brick with lots of articulation. I know Drifand said the plastic was of a cheaper quality, but I didn't get that impression. The plastic on it seemed pretty rugged to me. I kind of got the 'old solid toy from the 80's" vibe when I was handling it.