We are one of the world's leading distributors and providers of comprehensive supply chain management services to the global aerospace industry, based on annual sales. Our services range from traditional distribution to the management of supplier relationships, quality assurance, kitting, just-in-time (JIT) delivery, chemical management services (CMS), third-party logistics (3PL) or fourth-party logistics (4PL) programs and point-of-use inventory management. We supply over 550,000 active stock-keeping units (SKUs), including C-class hardware, chemicals, electronic components, bearings, tools and machined parts. In fiscal 2019, sales of hardware including bearings and other products represented 49.9% of our net sales, sales of chemicals represented 42.8% of our net sales and sales of electronic components represented 7.3% of our net sales. We serve our customers under both (1) long-term contractual arrangements (Contracts), which include JIT contracts that govern the provision of comprehensive outsourced supply chain management services and long-term agreements (LTAs) that typically set prices for specific products, and (2) ad hoc sales.
Founded in 1953 by the father of our current Chairman of the Board of Directors, we have grown to serve over 7,000 customers, which are primarily in the commercial, military and general aviation sectors, including the leading original equipment manufacturers (OEMs) and their subcontractors, through which we support nearly all major Western aircraft programs, and also sell products to airline-affiliated and independent maintenance, repair and overhaul (MRO) providers. We also service customers in the automotive, energy, health care, industrial, pharmaceutical and space sectors. We have approximately 3,300 employees and operate across 55 locations in 17 countries. The following charts illustrate the composition of our fiscal year 2019 net sales based on our sales data.
We offer more than 550,000 active SKUs, which fall into the following product categories during the year ended September 30, 2019 (dollars in thousands):