Stainless steel micro-mesh blocks leaves, pine needles and roof grit from entering your gutter. Heavy (Industrial) Gauge .019 100% Aluminum will not rust - Lifetime-Warranty water lock DIY Do-It-Yourself Installation...No special skills necessary.... Water lock DIY Easy to install on any Designed 5" wide gutter and won't void your roof warranty. Designed, Assembled and Packaged in the USA. MANUFACTURER 25-year warranty WHY MICROMESH? - 100% Manufactured in the USA, Heavy .019 gauge painted aluminum, Color-matched ½ zip screws included, fits on top of gutter, Double banded for easy installation and no sharp edges or damage to your roof because it does not touch your roof or shingles, Innovative pressing technology like no other that secures stainless steel mesh into aluminum frame safely, Will not gather rust or degrade over time