Twenty-six EVA foam tiles, one for every letter of the alphabet, each measuring 12.5 by 12.5 in and 0.4 in thick. The count is what makes the set useful past the first week: with a full alphabet on hand the floor becomes a spelling surface, so a child arranges names and short words rather than simply sitting on a padded square. Every letter lifts out of its tile and presses back in, which extends the same set from shape matching for a toddler to letter recognition and early spelling for an older child. That 0.4-in thickness does real work underneath. Soft foam cushions knees through crawling and kneeling and absorbs the impact of the falls that come with learning to stand, which is why the set suits children from 10 months and up rather than only those already walking. The surface is BPA-free and textured to resist slipping, so socks and bare feet keep their grip when play speeds up, and the set complies with ASTM and CPSIA. Water sits on the surface instead of soaking in, so juice, paint, and muddy footprints wipe away with a damp cloth and the foam does not hold a stain or a smell. Setup needs no tools and no adult supervision of a hardware bag: the puzzle edges press together, hold their alignment during play, and pull apart cleanly when the layout has to change size or move rooms. At 5.5 lbs the full 26-tile set stacks into a manageable pile for storage.