Vertebral Column with Painted Muscles organs creating a dynamic type of Arm Sling creating a dynamic type of flexion and extension movement ideal for building stronger forearms and for improving your grip – Strong and Reliable: Surgical stainless steel that you can rely on– Easy to Place: Silicone coated and with a high tensile strength– Multi Needle Packaging: 10 needles per blister mean less packaging waste– Ultimate Control: Each blister of 10 needles comes with an easy glide guide tube– Choice of Sizes: Pick from six lengths and seven widths– Pack Size: Each box contains 1 The left side of the vertebral column shows the points of origin (red) and the points of insertion (blue) of the muscles this model is painted to show the muscles