Toyota wants to salute do-gooders by giving 100 cars over 100 days to organizations that could really use a new set of wheels. And voters like you decide who gets a new ride every day.
PEI is the abbreviation for Porcelain Enamel Institute. A PEI Rating is given to a tile product based the hardness of its glaze. This hardness is determined by the manufacturer using a standardized test.
Being a natural stone, Travertine is extremely durable compared to most other flooring types (wood, vinyl, etc), and more than marble and slate. The durability of a porcelain tile is classified according to the PEI Rating, which is the durability index of porcelain and ceramic, and spans between 1-5 (higher PEI = more durable). E.g, Class 3 and above would suit both wall cladding and residential flooring. PEI-high porcelain would be more durable than Travertine.