The MD standard fiberglass screen is made of flexible fiberglass mesh for easy install. The screen is wrinkle-free, resistant to denting and unraveling and is perfect for DIY projects. "Standard fiberglass mesh" "Easy to install" "Wrinkle-free" "Fits 1-2 windows or 1 door" "Charcoal color" "Tools needed: frame spline tool spline 0.16 in. (size may vary based on screen frame) utility knife."