The Laperva Prostac blender works with the trade system; Twist and Lock Cup Organizer Jar good for grains and To save hanging space, it has a BlenderBall wire whisk, which can be placed in the dishwasher. It is top rack safe and the bottles contain a certain amount of liquid. pregnancy ring and With an adjustable StayOpen Lid, ProStar Lid, and secure flip-top lid keeping the bag dry, ProStars unique interlocking jars contain individual lids and use a patented blending system. This item cannot be exchanged or returned