This listing is for a set of 4 Samsung K4D263238F-QC50 memory chips.  These 4 chips will take your original Xbox memory from 64MB to 128MB.  They are compatible with 1.0-1.6 systems.  These chips have never been used and are in my own inventory here in the United States, still sealed on their factory roll.  Working 100% These are the real deal as we do not sell Chinese counterfeit parts.  These take some skill to solder on and can not be returned due to inability to preform the upgrade.  Please to do not buy these if you do not understand that or know what you are doing.  I will not be responsible for failed upgrades on your end, due to poor soldering skills.