Bumper guards are designed to protect the top edge of the racquet from getting damaged due to abrasion. The also have string guides (grommets) in them to pass the string through the frame of the racquet and prevent the string from rubbing against the frame which can cause it to break. 

From the options section please select the racquet you have from the presented list. If you do not see your racquet in the list please  and we will be happy to try and source it for you.