Kohler K-4666-SA-0 Elongated Toilet Seat With Anti-Microbial Agent And Self-Sustaining Check Hinge in White Perfect for commercial applications, this Lustra elongated toilet seat features extra-heavy construction and a chip-resistant polypropylene finish that will not stain or peel. This model has an open front and includes a check hinge that lets the seat stand up at 11 degrees beyond the vertical position. Elongated open front toilet seat Sturdy, chip-resistant polypropylene with a finish that won't stain or peel Includes an antimicrobial agent that protects the toilet seat from odor- and stain-causing bacteria, mold and mildew. Antimicrobial agent does not protect the user from disease-causing bacteria. Self-sustaining check hinge