Glass Design is a throwback to the 50's diner I loved. The spring loaded flip lid keeps the contents from spilling, and keeps the contents from clumping from moisture. Ribbed beehive shaped glass makes these shakers easy and comfortable to grip. Useful for salt of course, but also pepper, and any spices you want to keep dry. Good Grip, No Spill, Keeps spices Dry - No wonder those diners I loved used this style shaker.