Use this standard, double thick gallery matte board for projects that benefit from a deep bevel. You can select your mat color and opening size online
30x40 Standard Gallery Mat Board 8 PLY - Blank
Instant Gallery Wall 20 Piece Frame Set – Cooper & Co.
9x12 Natural Picture Frame with 6.5x9.5 Black Mat Opening for 7x10
Custom Maple Picture Frame 8x8 to 30x40 Personalized Mat Opening 2
Double Mats : 30X40 For 24X32 Artwork
Gallery White Frame by Simply Framed
Custom Mat Boards for Picture Frames, Cut to Size
Custom Size Mat Board for Frame / Picture Mount, Black Matte
This gallery photo frame is a stylish way to accentuate your favorite photo memories.Dimensions:L63xW1xH53 cm
Gallery Matt Board Photo Frame, 30x40cm
CustomPictureFrames.com 32x42 Black Picture Frame with 29.5x39.5