Stationery talk

One fine day a group of stationery are chatting when suddenly they started challenging one another about their good points.
"Hey i m the most flexible among u all", claimed the ruler.
"But i am the most sharp dun forget ", challenged the pencil.
"No no stil got me, i am the most smooth ", added the eraser.
"But i am the brightest!", exclaimed the hightlighter.
Then when it comes to the pencil box turn he seems a bit uncomfortable
" i cant think of anything good abt me , in fact i feel so empty..."
There was a long period of silence at this remark as the stationeries suddenly felt that there was no point in arguing for the best.
Then suddenly the highlighter said, " Dun worry you are best cos we will fill you up then you will have all our good points."