Good Material----This muffler insert is made of iron, which has high hardness. So it is very durable for DB killer 45mm Good Material ---- This muffler insert is made of iron, which has high hardness. So it is very durable for DB-Killer 45mm Multiple Choices ---- These items are suitable for 35mm/42mm/45mm tailpipe diameter, and there are three diameter measurements to choose from. You can choose the right one Eco-friendly----Eco-friendly can effectively reduce noise, on the other hand, it can also reduce noise pollution, which is environmentally friendly. Operating Principle ---- Using a muffler near the end of the vehicle exhaust system, its operating principle is destructive interference and absorption. The muffler wall consists of two layers of steelStainless steel that helps reduce vibration and absorb noise Features----Easy installation, adjustable and detachable Properties: 1. Removable universal silencer. 2. Can effectively reduce the sound of low-pitched sounds, and also reduce sound pollution. 3. Metal construction, very durable. 4. Easy installation, adjustable and detachable. 5. Suitable for tailpipe diameters of 35 mm/42 mm/45 mm. Properties: Color: Silver Material: metal Package weight: approx. 112g Optional base diameter (millimeters): 35 mm / 42 mm / 45 mm Optional diameter (inches): 1.38/ 1.65/ 1.77" "