MezuzahStore.com has several different qualities of Tefillin to choose from.  We also offer Tefillin made according to most prevalent customs.  Whichever pair you choose, you can rest assured that it will be 100% Kosher.  The Tefillin which we sell are made in Israel.  We then check and assemble the parts of the Tefillin in our workshop in Los Angeles.  This allows us to maintain a very high standard of quality.  Each pair of Tefillin also comes complete with a set of protective boxes and a velvet bag.