Features: Easy to install, beautiful appearance, very fashionable, low cost, is the first choice for decorative car. The length of the product is only the length of the whistle, not the length of the fixed frame Widely used for all vehicle models. Under the premise of suitable installation size, better to choose a larger size. For small output volume car, better to choose a large size, for large output volume car, better to choose a little bit smaller, because the principle of whistle sound  is to rely on air flow, large displacement, the greater the whistle, the more likely to make a sound. Specifications: Material: Aluminum alloy Color:Silver,Black, Red, Gold, Blue Size: M Material type: Iron + aluminum Item type: Silencer product Size: Approx. 60*22*60mm/2.36*0.86*2.36\'\' Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding.