Here are the concepts included:

alphabet letters with picture (26) 

words from alphabet cards with first letter highlighted (26)

large colorful upper case letters (26)

large colorful lower case letters (26)

ASL hand signs for each of the letters (26)

colors with color names (12)

color name words in color (12)

color name words in black (12)

picture for each color, no words (12)

shapes with names (12)

real world pictures of things that resemble each shape (12)

number cards with number, pictures and number name (12)

Large colorful numbers and number name (12)

sets of black dots 1-12 (12)

plus, minus, equals, signs  (4)

large Dolch sight words for preschool (40)

often used nouns with pictures (16)

opposites with pictures (24)

rhyming words with pictures (24)

emotions and feeling photos (12)

diections to follow, with picture clues (8)

food pictures with words (24)

animal pictures with words (24)

transportation pictures with words (12)

home pictures with words (12)

our natural world pictures with words (12)

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Here are some thumbnail samples: