Totes, dividers and covers are made of conductive black polyproylene material with a surface resistivity of less than 10^5 ohms/sq. Electrical properties are unaffected by solvents or humidity and totes do not outgas harmful contaminants. Totes can be divided into compartments by length and/or width, with optional dividers, at 1/4 intervals and come complete with snaps for card holder (sold separately). Optional covers protect product from impact, dust and chemicals. Snap-on style cover snaps easily and securely to grip tote box on all sides. Insert-style cover fits inside the container on the stacking ridge, ideal for stacking applications. Dividers and covers sold separately.