The diagrams display that a picture frame consist of four main parts, which include the frame itself, glass, clips (one at the top and one at the bottom) and backing which is made of paper or wood. Glass fits between the frames and it serves to cover and protect the picture or photograph.
To begin with, diagram B is a rectangle shape. The width is 20 centimeters and height is 30 cm. It has a thin structure, which is made of the silver and it is suitable for large picture.
On the other hand, diagram C is appropriate for small picture. It is assembled by a wider wood instead of silver and has unlike appear rather than diagram B. Its size is 19 cm for width and has similar height with frame B.
Therefore, it is clear that these frames are used for various art. Diagram C is cost-effective and users can choose the diagram B for high value photo. (160 words)
