Holy cow! How rad are these Rainbow Hued Tumblers from the MOMA Design Store? Answer: So Rad. I know you’re probably thinking that it would be too risky to buy these, because drinking glasses — especially fancy drinking glasses — break so darn easily. But while these tumblers look like glass, they are made of durable acrylic! Their teardrop-shaped interior has a rainbow effect that radiates from the base throughout the tumbler.