Kubisport Strengthening springs with 5 springs

The booster springs have 5 springs that can be freely removed and simply installed back into the expander. The length of the springs is 37 cm, while the length including the handles reaches 56 cm. Total length when stretched is 125 cm. These booster dicks come in either a blister pack or a cardboard box. It is used to strengthen the arms and pectoral muscles.