These are shatter-resistant, reinforced plastic champagne glasses. They have a luxurious appearance, making them suitable for everyday use in homes with young children. They're also lightweight and durable, making them ideal for BBQs, camping, and picnics. I washed them once, and I've used two of the glasses once. The box has been disposed of. There is no noticeable damage, but when held up to the light, there are some water spots and very faint polishing marks. Made in Japan, and dishwasher safe!