Profile: National Plastics, Inc. offers clamshell packaging, stock clamshells and blister packs. Our clamshell products include stock clam shells, tri-fold clam shells and clam shell trays. Our applications for plastic trays include medical and dental instrument trays, packaging inserts, food packaging trays, shipping & storage trays as well as material handling trays. Our blister packaging is an inexpensive option for creating packages that are durable, transparent and tamper proof. Our brands include StockClam™.