Braille Push Cells allow students to push 'dots' on one side down and they will pop out the other side.
These are perfect for teaching the slate and stylus and dot location.
They are available in a wide variety of configurations and can be customized for a specific color if you want to e-mail email@example.com directly.
Options for 1x10, 2x5, 3x3, 1x6 are presented here but others can be created. Most colors can be accommodated at request.