It is lightweight and used on a variety of bicycles such as sport cars, BMX. Uses geralumin used for aircraft. Common aluminum apple (JIS standard: BC1.8). The weight is about 0.38g. Product color and size: The color of the product may look different from the actual product depending on your display settings. Product specifications, logo design, etc. may be subject to change for product improvement. We also cannot answer measurements or personal fit that the manufacturer does not announce. Please be aware of