26 high quality letter mats (A-Z). The letters can be popped out! Each order covers 26 square feet! This set does NOT come with any border pieces. * Each mat measure 12" x 12" (inches) interlocking foam mats. Easy do-it-yourself interlocking foam tiles. Lasts up to 5 years under proper care. * Each mat is ~9/16" of an inche thick. Its thickness meets the minimum protection requirement for children. * Have passed ASTM standards, including bite and choke tests, and 53 substances of very high concern screening. Will provide report upon request. * Instrument for development and learning. Perfect with our counting numbers mat.