Children Spring Chest Developer with tension adjustment,perfect for kids to strengthen griping power and expand chest.<br/>Features:<br />Perfect for kids to strengthen griping power and expand chest.<br />5 elastic stainless steel spring with detachable hooks can be added or removed to adjust different tension stregth for kids.But it is recommended not to have less than three springs.<br />Max. 5 kilograms load for each spring.<br />Ergonomic handles for perfect fit and comfortable grip.<br />Detachable and foldable design for easy storage and carry.<br />Great for indoors and outdoors,like home,garden,parks etc.<br/>Specification: <br />Color: Red / Yellow / Green (optional)<br />Material: PP &amp; Stainless Steel<br />Size: 44*9cm/17.3*3.5in<br />Package weight: Approx. 320g/11.3oz<br />Package size: 28*10*3cm/11.0*3.9*1.2in<br/>Package List:<br />1* Kids Spring Expander