I believe they are a combination of PVC and ABS plastic, the soft, dense plastic is the pvc, and the hard hollow parts are the ABS. i think the figures look awesome but due to their designed i find the poseablility to be quite limited, since its a super poseable and isn't supposed to have accurate proportions, they couldve altered a few things to make it more poseable like making the arms a bit longers and the chest not so deep, that way you could get mor ecoordination between the arms, necks shudve been ball joint, the waise definitely shouldve been a ball joint, and they shouldve done something to give the hips more spread