What are the different types of picture frame pieces available for custom framing?

The different types of picture frame pieces available for custom framing include matting, glass or acrylic glazing, backing board, and the frame itself. Matting is a border around the artwork that adds depth and visual appeal. Glass or acrylic glazing protects the artwork from dust and damage. The backing board provides support for the artwork. The frame is the outer border that enhances the overall look of the piece.