What's the Best Material for Picture Frame Backing and What Holds

Hi guys! Just a quick question or two I hope someone can help me with. I'm making a last minute picture frame as a holiday gift, and I'm not sure what to use for the backing board. I'm talking about the material that holds everything in the frame, not the matte for the photo or anything like that

Picture Frame Easel Back Support which made of high quality plastic material,has advantages of high durability, with good toughness, long service life, not easy to damage. Quality picture frame easel back support, mainly used to support photos or picture frames, stabilize the photos on our desktop,it's convenient for our daily life.

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