Color: gold 30 spare blades Application note 1. The blades are extremely sharp, please note this when assembling. 2. If the cut looks uneven and dirty, it is time to change the blades. Please always replace all used blades with new ones. 3. We recommend replacing the screws when changing the blades. 4. It does not make sense to turn the blade over, because the direction of rotation of your robotic lawnmower changes normally. Functionality 1. Smooth Cut: Due to the thickness of 0.75mm and weight of 3g, replacement lawn mower blades produce a smooth and even cut. The axle load is not affected by the slightly heavier weight. 2. Long Lifetime: The blade set is made of stainless steel, which guarantees a long service life. The screws supplied are also made of stainless steel. 3. High Security: The robotic spare blades for the automatic motor are made of high-quality materials and are durable. Even if the blade meets resistance such as stones, it remains safe for use around animals and children.