500, 600 & 700 Swivel Wheel Mod
Now available for your Roomba is a modified swivel front wheel that has a neoprene O ring installed in the center of the hard plastic black/white wheel. This O ring mod can possibly prevent the Roomba from scratching polished floors. Give one a try, the complete wheel mod can be yours for only $15 plus $2.60 USPS shipping or $4.60 International shipping.
Just send a paypal for $17.60 USA or $21.60 International shipping to: email@example.com and mention "O-ring mod"