CASIO fx-991EX Spiderman shell

This is a replacement shell for the CASIO fx-991EX that adds a bit of web-slinging to tricky calculations.It fits genuine CASIO fx-991EX calculators by removing simply removing the six screws on the back and using the same screws to secure the new back.NOTE: This shell is designed as a complete replacement and the existing sliding cover will no longer fit.