1. Door Buddy Adjustable Door Strap: The simpler way to keep dog out of room with litter box and cat food while still allowing your cat to have easy access. Plus, the handy cat door stopper will prop your door open and prevent your pets from accidentally closing the door. It is also preferred over a dog gate with cat door or cat doors for interior doors. 2. How Does It Work: Door pet door strap allows the door to any interior room to open just wide enough so cats can easily enter or exit, but at the same time keep it narrow enough so dogs (if slightly larger than cat) cannot get in. The pet door stopper prevents the door from closing and serve as a guard to prevent pinched tails (or fingers) 3. It"s Easy : With easy access from either side of the door, locked or not, dog strap doesn"t inhibit your movement whatsoever. Because there is no cutting, measuring, double sided tape or screws to fumble with, flex latch strap won"t ruin your paint, and won"t damage your home 4. Size: 25 cm. Perfectly sized for your cat to feel comfortable and confident that no intrusive dogs pester them in their private space. 5. It"s Versatile secures to most doorknob styles and attaches and detaches quickly and easily in seconds. Discreet, low-key, and means business. it can travel anywhere with you and your pets, even on vacation and the cat door holder latch will be your favorite travel accessory. Material: PE Package included: 1 x Flex Latch Strap Note Please allow 2-3 cm difference due to manual measurement. Besides different computers display colors differently, the color of the actual item may vary slightly from the below images, thanks for your understanding(1 inch = 2.54 cm)