Most manufacturers supply rubber dam in three thicknesses or grades, for different applications. Depending upon the manufacturer, these will be designated either light, medium and heavy, or medium, heavy and extra-heavy. The thinnest of the three is more prone to splitting, and the heaviest more difficult to manipulate, which means that the most widely used is the middle grade. The sheets are presented in a variety of colours, some being impregnated with peppermint and other scents to disguise the smell of the rubber. The feel of rubber against the skin may be countered by simply placing a gauze underneath the dam.
A pack of latex free dam is also necessary for patients with latex allergies. This material appears slightly stiff at first but stretching the sheet a few times makes it easier to handle.