Material: Made of PC and PP material is stain and odor-resistant, so jars remain clean, clear and fresh; dishwasher safe. | Includes Four Containers: (1) 40cc jar, (1) 60cc jar, (1) 100cc jar, and (1) 150cc jar. | Stackable: Interlocking containers for carrying powders, vitamins, supplements, and snacks. | Removable Carry Handle: For easy carrying or clipping to bag; stack fits inside shaker bottles for portability. | Lock System: Twisting and lock system connects containers of any size in any order; a quarter turn locks them together.