they analyzed each gram of plastic added to the product to arrive at the perfect balance of sturdiness while minimizing the amount of precious recycled resources used. Material isn't the only thing that creates Strength And durability- It's the curved shape of the plates, bowls and cups that makes all the difference. Each Silhouette was specially designed for ease of use, shaped and weighted for stability and resistance to spills. As a result, preserve's everyday tableware is durable enough to last decades-they can literally be used thousands of times.