Is this item 5" or 6"??????????????

The product you were viewing was D80 (which is 80mm in diameter) and it's for the Rotex 90 sander.The 125mm (5") polishing pad link is:http://www.festoolproducts.com/festool-492128-ro125-feq-stickfix-polishing-pad-hard-125mm-5-in.htmlThe 150mm (6") polishing pad link is:http://www.festoolproducts.com/festool-496151-stickfix-polishing-pad-for-ro150feq.htmlPlease note these are for polishing applications only with a foam, sheepsking or felt polishing medium.