<p> This tube is carefully selected after we have <b>compared the product from many different  manufactures</b>. We are also slingshot players and this tube is the most highly valued one by lots of Chinese slingshot players.  </p> <p></p> <p></p> <p>The tube is made of natural latex, which has below properties like:</p> <p></p> <p></p> <p></p> <ul> <li>High elongation </li> <li><b>Great  elasticity  </b></li> <li>High Concentricity </li> <li><b>Long  durability </b></li> <li><b>High</b> contraction <b>velocity</b></li> <li>Inner Diameter: 0.2”(5mm) approximate</li> <li>Outer Diameter: 5/16"(8mm) approximate<br></li> </ul> <p></p> <p></p> <p></p> <p>It is the best material for your slingshot or replacement of tensile rope on your fitness equipment. </p> <p></p> <p></p> <p>No Instruction  or manual is provided for this DIY material.     </p>