1. Beautiful Decoration for Glass Window and Door: YOUTHINK small pet door is transparent, so after installation on clear glass window or door, it blends seamlessly; Ideal for installation on glass windows and sliding glass doors2. Fit for Cats and Small Dogs: Flap size is 7.25 x 8 inches; This small dog door accommodates all cat breeds and small dogs up to 6 kg (13 lbs)3. Noise Reduction: The small dog flap features a brush strip design to minimize noise when pets pass through; Smooth and quiet operation helps prevent startling pets or disturbing household members4. Materials: Pet flap is constructed from high-quality ABS and weather-resistant polycarbonate materials; Durable and sturdy design ensures long-lasting performance and enhanced strength