Guerrilla Silicone case in pink color is suitable to use with texas instruments TI 89 titanium graphing calculator. Guerrilla Silicone case in pink color is made of highest quality silicone material for durability and is fully wrapped around the case. Case allows easy access to all buttons and offers superior protection to your titanium graphing calculator. • Pink. • Compatible with Texas Instruments TI 89 titanium graphing calculator. • Material: Silicone. • Durability: Tear resistant. • Sold as 1 Each.