This picture frame mat will hold nine openings for ACEO,s, trading cards or small photos Choose from the COLOR LIST BELOW or you may request colors of your choosing and I will let you know if I can provide them for you. They are from left to right: Bright White, Light Grey, Medium Grey, Soft White, Pink, Cream, Red, True Green, Spring Green, Forrest Green, Light Blue, Royal Blue, Sky Blue, Navy, Brown, Tan, Charcoal, Gold, Silver, Black The largest opening is 4.25" x 6". The largest of the smaller ones is 2 x 3" Fabric matting is also available. Fabric matting adds an elegant touch. 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 please contact us if you have a problem