Customized Protective Foam Inserts are available in the following options: high-density polyethylene (Ethafoam) - better for heavier equipment loads medium-density polyurethane (Esterfoam) - multi-purpose foam used in the majority of applications provides an excellent cushion ride while ensuring equipment protection low-density polyurethane - very soft material used mainly for lining the interior of lids which provide a soft cushion pressure to hold our customers valuable products anti-static (pink) Ethafoam comes in the medium- to high-density range and is used not only to protect valuables, but also provides ESD (electrostatic discharge) protection for electronics and sensitive products. The foam actually 'draws' away the discharge. colour availability includes charcoal, white, black and pink choice of seven thicknesses: 1/4", 1/2", 1", 1-1/2", 2", 3" or 4". Customized thicknesses also available.