Tritan Crystal is 100-percent dishwasher safe-it will not etch, cloud or discolor for the life of the glass. Tritan resists the damages of daily use-breakage, chipping and scratching. Tritan is thermal shock resistant. Tritan is one of the most clear and brilliant crystal, capable of conducting, refracting and transferring light more than any other crystal. Tritan tempers the rim, the bowl and stem joint and the foot edge for added strength against chipping and breakage. All crystal items manufactured by Schott Zwiesel are cut with our patented laser technology for a smooth thin, elegant edge. All stemware products are seamless after manufacturing; no unsightly seams remain between the bowl and stem, on the stem , or under the foot of the glass. Each detail of size, weight and balance is carefully studied by experts in the culinary field and our manufacturing engineers and executes to produce a glass for the maximum pleasure with focus on delivering the wine or spirit to its maximum potential. Pure is the collection when seeking fashion and dramatic styling. Its crisp lines create a geometric modern look. Pure is a full line with every proper stem for your favorite drink. This set of 6 Tritan crystal Martini styled stemware pieces is best utilized with martinis and mixed drinks. Dishwasher safe.