Black plastic POSTER size 12x18 frame with Corrugated Backing - Picture Frames, Photo Albums, Personalized and Engraved Digital Photo Gifts - SendAFrame
12"x18" Black Wood Ready-Made Picture Frame (suits 30.5x45.5 cm paper) with Clear Glass - Photo Frames and Picture Frames Online Store
Picture Frame Sizes - Best4Frames
MCS Format Frames
12x18 Chevron Picture Frames Handmade Art Wall Hanging – Handicrafts Home
12" X 18" Poster Farme - Threshold™ : Target
Helpful Photo Frame Size Conversion Chart for Standard Frame Sizes