In general, every motor vehicle in Singapore requires a vehicle registration number to be displayed at the front center (in almost all cases or otherwise set by car manufacturer due to bumper constraints) and rear of the vehicle. Two colour schemes are in use: the black-on-white (front of the vehicle) and black-on-yellow (rear) scheme, or the popular white-on-black scheme either represented in rectangular single line or squarish two line format. The number plate has to be made of a reflective plastic with flat characters or metallic with embossed characters which are black (for white-yellow), or white or silver (for black ones).