These lenses are the Air Optix Night & Day, previously known as Focus Night & Day.
6 lenses per pack.

Air Optix Night & Day lenses are extended wear lenses. This means that following the appropriate eye examinations, they can be left in the eye continuously for up to 30 days (even when sleeping).  It is however very important to take the lenses out and have a rest from them if they are ever uncomfortable.  You never should sleep with with your lenses if your eyes are uncomfortable or sore.

Note:  As of June 2012 the Focus Night & Day lenses are being updated to Air Optix Night and Day.  The lenses are staying the same but the name and shape of the box are changing.  If you wear Focus Night and Day you don't have to update your prescription.  For a few months you will tend to get the lenses in the old box but you will find that more and more will come in the new boxes as the old boxes get used up.
With the new lenses there as some minor new features.  The new lenses have a very light blue handling tint which will let you find them in a white lens case slightly more easily.  This won't alter your vision or change the colour of your eyes.  Also some moisturising solution has been added to the lens blisters which might make them a little more comfortable the first day they are worn.  If you have any questions on concerns please contact us.

These lenses are also known as Easy Vision Day and Night when sold by the SpecSavers optometry group.