mTiny felts ONLY fit the mTiny explorer kit (P1030157). A color marker accessory pack which includes a color marker. Kids can add the color marker to the bottom of mTiny to turn the robot into a painter. Working with instructional coding cards, mTiny can draw different images on white paper. The color markers enable mTiny to draw letters, shapes and numbers, which allows to integrate concepts of Math and Literacy in a lesson. The ink is water-based, they come in 4 different colors and can be easily installed or exchanged with adult supervision.