This picture frame photo mat is perfect for your group of photos. The largest opening is about 6 x 9 and the larger of the smaller openings is about 2.5 x4" Choose from the COLOR LIST BELOW. The second picture shows our archival stock mats. COLOR LIST: They are from left to right: Bright White, Light Grey, Medium Grey Soft White, Pink, Cream, Red, Kelly Green, Spring Green, Forrest Green, Light Blue, Royal Blue, Sky Blue, Navy, Brown, Tan, Charcoal, Gold, Silver, Black. We also have yellow not shown. The matting is conservation quality to protect your art or photos. Custom Sizes are also available CHOOSING THE CORRECT MAT SIZE When purchasing a mat for a picture frame be aware that your standard frame should measure at least 1/8” larger than the size of the mat you purchase. In other words an 11 x 14” frame should actually measure at least 11 1/8” x 14 1/8”. You mat will measure 11 x 14”. In addition there is a 1/16” allowance on the mat so it can measure 10 15/16” x 13 15/16” up to 11 1/16” up to 14 1/16” and still fit in your standard frame. Some less expensive frames may not have the allowance so you would need to ask for a size that is at least 1/8” smaller than the opening on the frame itself. All are mats are individually custom cut "one by one" for your order specifically. We do not stock them already cut . For that reason they cannot be returned but if you have a problem please contact us and we will see what we can do to resolve your problem.