This unique functional model combines the features of the skeleton and muscles in a life-size replica of the human arm. The bending and stretching muscles of the upper arm and the rotator muscles of the forearm are attached to the bones of the arm. The pronator and supinator muscles demonstrate movement around the rotary axis. Constructed of sturdy plastic. Muscles are made of natural rubber (lifetime: 2 years). Does not dissect. Mounted on a removable stand with base. Size: 10" x 18" x 33". Somso Modelle.