Be sure to add me to your favorites list Casio 80's / 90's Small Keyboard Replacement 2 1/2" Inch Diameter, 4 Ohm Speaker for some SA, SK, and PT Model Casio Keyboards This is a very good condition speaker for a 1980's / 1990's era small sized Casio keyboard. It is a 2 1/2" diameter speaker, made by Casio and used in some of the smaller sized Casio keyboards with mini keys, with the model number starting with SA, PT, and perhaps SK as well. It's 4 ohms and in great condition and working perfectly. You can see in the photo that there are 2 brackets and 2 screws attached to the magnet in the speaker and they will be included as well. You may or may not need the brackets for your model. You will have to splice or solder the wires to get them to work with your keyboard obviously. I have a two of these available. Please make sure your Casio keyboard takes the 2 1/2 inch speaker with these specs and they should make a great replacement! The part # listed on the back of it is C06573C, and it was made in Taiwan. Please check out my Store!