One of the high-grade material is acrylic, which is highly invisible like crystal and traditional glass, but it is not expensive as crystal, and not fragile as normal glass. Acrylic blocking document frames are ideal for showing the diploma of the degree in an economic and safe way. The highly transparent acrylic ensures diplomas inside are the highlight and the center of attention. Blocks can be secured by magnets at all four corners or not, depending on personal or professional need. Most commonly, colleges and universities prefer it to be Mahogany, Cherry, and Walnut finish, but some choose black, gold and silver.