Found Montessori Pink Series

The set contains 26 lower case print sandpaper letters and a wooden box.

The consonants are on boards painted pink, and the vowels are on boards painted blue.

Colour Box 3 contains plastic tablets, all the same size and shape, with end bars long enough for holding the tablets without touching the colored part of the tablet.

The wooden box with 9 compartments, each compartment containing 7 color tablets in gradation of one color: red, pink, blue, yellow, purple, green, orange, brown, and grey.

There is only a slight difference between any two shades. Purpose: refinement of color perception.