Soft Expander is good use for extension and relaxation of all body muscles.
Yellow (Extra Light) 9mm x 1.9mm x 110cm
Green (Light) 10mm x 2mm x 110cm
Red (Medium) 11mm x 2.3mm x 110cm
Blue (Strong) 12mm x 3mm x 110cm
Purple (Extra Strong) 13mm x 3.5mm x 110cm