units” include all items that form an integral, interconnected package that, when sold to plasmapheresis centers and blood banks, are used to collect blood or blood components, which are then sold together with the bags and tubing in which they are contained. Blood pack units consist of a plastic bag or bags, tubing, and a needle. Blood collection units are either a manual system that includes a needle, multiple bags, a bag containing saline solution, tubing, filters, grommets, and a pooling bag or an automated system that consists of a needle, a bag of anticoagulant, tubing, a plastic bowl containing a stainless steel centrifuge and a pooling bag. Blood collection units and blood pack units also include plastic bags and tubing sold to plasmapheresis centers when those centers use them to collect blood plasma or platelets and then sell the plasma or platelets together with the bags and tubing in which they are contained.