Perfect for outdoor dining, camping and picnics Not microwave safe Dishwasher safe (top rack only) Effortlessly stylish and highly practical, embrace outdoor entertaining with the Salisbury & Co Unbreakable range. Made from premium quality, durable, lightweight and shatterproof polycarbonate with the clarity of real glass, this set of four tumbler glasses are virtually unbreakable, making them perfect for outdoor dining, camping and picnics.