Horse Armature (System)- TruFormThe TruForm Equine Armature System from SculptureDepot. net is the most advanced clay sculpture armature on the market for clay modeling. Our horse armature moves anatomically correct in every position. Our equine armature is made of the same durable materials as our Truform figure armatures. The ribcage is made of rigid foam that will not flex side to side and is best if your horse is moving in a straight line. You can cut the ribcage foam to adjust