These coasters were disappointing to say the least. Industrial and Scientific grade? Not at all, they barely hold up against normal wear and tear, let alone commercial use .Using this product, our team found that they were constantly slipping and sliding around, creating a hazardous environment for our customers. The only pro is that they were aesthetically pleasing, but unfortunately that`s not enough to outweigh the cons. Save your money and invest in a more durable product..See full review