There are three thicknesses available when ordering your Diamond clear covers. The most popular thickness is the heavy weight (10mil). The second most popular is medium weight (7mil), followed by the light weight (5mil). The thicker heavy weight will give your document more protection and integrity. If the document/proposal is going to be handled frequently we recommend the heavy or medium weight Diamond clear covers. Please ask one of our salespeople for a swatchbook, which shows all three thicknesses of Diamond clear covers along with all of our other stock options.