MSI's product line includes an extensive offering of Granite , Quartz , Porcelain , Luxury Vinyl flooring , Slate , Marble , Travertine , Sandstone , Limestone , Quartzite , onyx , stacked stone and pavers imported from over 36 countries on six continents. Summary: The Customer Service Representative (CSR) is an on-site role responsible for engaging with customers through multiple channels, including phone, email, and in-person interactions.