Schurter’s metal pushbutton switch (MSM CS) has a stainless steel housing and an actuator material consisting of durable ceramic that is resistant to scratches, abrasions, impact and chemicals.  It is hypoallergenic to the touch and lettering or symbols can be applied with a positive or negative effect.  Aluminum and steel are highly effective materials for switches used in harsh environments, but the material is not very compatible with printed or screened legends.  The composition of the ceramic surface base material and the lettering process account for the actuators resistance to wear, exposure and abuse. Furthermore the fully translucent actuator provides a much larger illuminated area which is clearly visible from any angle.