Adds 2 extra inches of front entryway wall height from 7" to 9" to prevent cats from peeing outside over the entryway. Seal handle openings to prevent cats from peeing through the openings. Essential upgrade for high-peeing cats. Made of solid, LFGB 100% Platinum-Cured Silicone without plastic. It is medical-grade, above food-grade, extremely antimicrobial, non-toxic, durable, and waterproof