This case of 10 pieces covers 9.7 sq. ft. and weighs 35 lbs. It contains grade 1, mesh-mounted glass blend mosaic tiles suitable for both wall and countertop use. The tiles measure 11.81 in. x 12 in. x 5/16 in. and have a smooth finish with a medium sheen and slight variation in tone. With a P.E.I. rating of 0, they are recommended for wall use only. These tiles are impervious, with a water absorption rate of less than 0.5%, making them suitable for indoor or outdoor use. The C.O.F. rating does not apply to wall tiles. These tiles are completely frost resistant for both indoor and outdoor applications. For optimal bond strength, use a latex-modified thinset. Suitable for both residential and commercial use.