Features:Great Fit For Door: Flap Only. Features 4 hole at the top of the flap for perfect alignment.Quick Easy Installation: Installs in just minutes with only screwdriver. It is easy, you will be kicking yourself for not replacing that old dogs door soon.High-Quality Material: This flap compatible with Cats Door and Dog Door is made from flexible, durable, weather resistant TPU-materials.Weather Tight & Weather Resistant: Magnetic strip at bottom of flap securely connects flap the magnetic interfaces at the bottom of your cats door / dog door to keep outside weather from blowing inside.Compatible With Many Door: 2 Size of Replacement Flap to choose. Medium is about 32.2x20.5cm; Large is about 43x26cm. Specifications:Material: TPU-MaterialColor: As Pictures ShowSize (Approx.): M-32.2x20.5cmL-43x26cm/16.93x10.24inWeight (Approx.): M-225gL-430g Note:1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks Package includes:1 Piece Dog Door Flap Replacement (Medium/Large)