Answer:
We are five little objects of an everyday sort. You will find us all in a tennis court.
What an fill a room but takes up no space?
Put into a pit, locked beneath a grate, guarded through the night, yet it still goes out.
I scribble forms of the finest letter, And repel elements of the harshest weather. I am an arrow-aimer and a dust-breaker.
Held firmly in the hands, like a sword it cuts deep. Bloodless strokes, all, then forward we leap.
What covers its face with its hands, speaks no language, yet most known what it's saying?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?