This is a bumper bot chassis, 15 cm x 14.5 cm. 

You can use this chassis to make a fighting robot like a sumo robot or a bumper bot. This chassis is meant for an Arduino UNO, an L298N driver module, an ultrasonic sensor, and three infrared line sensors. Hope you like this model. :)

Material list:

• 1 Arduino UNO
• 1 L298N driver module
• 1 Ultrasonic sensor
• 3 Infrared line sensors
• 2 Pololu motors 
• 1 Caster wheel