140mm brake disc for an electric scooter. It is a replacement part compatible with several models. 
Size: 140mm diameter. 
Material: Typically crafted from robust, corrosion-resistant stainless steel. 
Compatibility: Known to be compatible with models such as the Kugoo M4, M4 Pro, G-Booster, and Segway-Ninebot F series, among others. 
Design: Features a perforated design to help with heat distribution and reduce overheating during braking.