The joints of the dolls make use of stainless steel, making them bendable like human beings. However, bending the joints incorrectly is not recommended. This can lead to broken joints. New dolls can be stiff, so it is advisable to pose them using firm, firm grips on each side of the joint to avoid twisting the body in an incorrect way. A new doll’s joints usually creak a little bit. Over time, they will loosen with repeated use.