This is an "in trade" listing.

All buyers of this auction are entitled to a free capacitive stylus; colour choice will be random. These work on iPhone, iPad, Galaxy, etc [anything with a capacitive touch sensitive screen]. Just search for

"iPad stylus pen, 10 cm"

buy one at $1, select $0 freight. I'll then include a free pen, and waive the $1 cost of that auction.

Genuine Crucial Technology 1.35V 4Gb 4 Gb DDR3-1333 [PC3-10600] SoDIMM ram for laptops, including 2011 iMac and 2011 MacBookPro [excludes retina display MacBookPro which are not upgradable].

Confirm your computer is compatible with DDR3-1333 204 pin SoDIMM modules before purchasing.

Crucial has a handy system checker so you can work it out for yourself.

http://www.crucial.com/store/drammemory.aspx

Here is Crucial's URL for the specific module being sold

http://www.crucial.com/store/partspecs.aspx?IMODULE=CT4G3S1339M

Lifetime warranty to original purchaser. Must be installed using correct procedures, including antistatic strap, etc. Crucial have a useful install video for installing such ram.

Authorised Crucial reseller, established 1989. A tax invoice will be issued.