Hi,
If you have previous experience, with care, these should be enough for one room. If you are not very experienced you are better with a 10 pack (see my other listings).
High quality strong sandpaper 
3 x 40 Grit
1 x 80 Grit
1 x 120 Grit
I've sanded floors for 25 years (oh dear!), but as a result, I include a page on tips to ensure you dont throw money down the drain when starting sanding.
If you are unsure about your requirements, call me to discuss. I'm in South Manchester, if you are too & need these urgently you can pickup from wherever I'm working if you text me in advance. 0777 333 7386
Regards,
D