Main Features:<br />Centre hole about 7mm? the other 2 hole it is about 2mm<br />Use carbon content of 100% pure carbon fiber<br />High temperature and pressure prefabricated precision machining? hardness higher than conventional products market<br />Pros and cons of each pair full carbon fiber trim by artificial pitch are static and dynamic balance<br /><br />    Specifications<br />Specifications<br />  Type: Motor                                                  <br />                        Feature: Tools/accessories of radio control series toy                                                  <br />                        Age: Small parts not for chidren under 3 years                                                 <br />Dimension and Weight<br />  Product Weight: 2.6 g (1pcs)                                                  <br />                        Package Weight: 0.098 kg                                                  <br />                        Product Size (L x W x H): 15.1 x 1.7 x 0.1 cm / 5.945 x 0.669 x 0.039 inches (1pcs)                                                  <br />                        Package Size (L x W x H): 17 x 7 x 1 cm                                                 <br />Package Contents<br />  Package Contents: 2 x Pairs of Propellers                                                 <br /><br /><br /><br />                                            <br /><br />                       Product Safety Disclaimer: <br />We do not accept any responsibility or liability for misuse of this or any other product.  All our products are extensively tested to comply with rigorous and strict QC standards.  For certain products (e.g. toys? knives? etc.)? we recommend proper supervision as we cannot be held liable for misuse or accidents.<br /><br />                                                <br />