Safe at a temperature range of -190c to +121c 5.25"x5.25"x1.5" dimensions Holds 100 .5ml microcentrifuge tubes Printed numeric index on lid makes for easy identification Autoclavable Polycarbonate build Made of tough polycarbonate plastic, this autoclavable microcentrifuge tube box is built to last in temperatures from -190c to +121c. It has a numbered index printed on the transparent lid for convenient organization of up to 100 .5ml units.