This is custom leather flip case with magnetic clasp for financial calculators. Upgrade your stock case to this case. It is designed for HP financial calculators including the HP 10B/10BII/10BII+, HP 32S/32SII, HP 17B/17BII/17BII+, HP 20S, and the HP 42S. It also fits many TI, Casio, and other calculators. Outside dimensions: 6.25" x 3.75" x 1"