Montessori Phonics Initial Sound Cards are designed to facilitate the process of learning to read as an addition to Montessori Language materials:
Sandpaper Letters
Moveable Alphabet (affiliate links)
Please note that these cards are also available with the pink border PLUS vowels with the blue border and black border:
Montessori Phonics Initial Sound Cards Without Border
Montessori Phonics Initial Sound Cards with Pink Border