These are the now discontinued Crest 3D Pro effects whitestrips without the new "TM Grip Seal" technology that helps with a slightly better adhesive bond on the teeth.
There's some really great offers on these, though just remember to apply slowly and gently to get the best grip (especially on the lower teeth) The whitening effects and 6% HP content is the same as the latest stock, so just wear for 30mins-1hr depending on your teeth sensitivity.
