Product 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, its time to change the blades. Please always exchange all used knives for a new replacement blade 3. We recommend that you replace the screws directly 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 IMAGE]: 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 STAINLESS 3. [HIGH SECURITY]: The robotic spare blades for the automatic motor can not break the use of s. Even if the blade meets resistance (stones or similar) - ideal for animal safety and children