Inventories

6 Months Ended

Jun. 30, 2020

Inventories consisted of the following:


(In thousands)	June 30, 2020		December 31, 2019
Raw materials:
Fluids systems	$	118,684	$	141,314
Mats and integrated services	3,982		5,049
Total raw materials	122,666		146,363
Blended fluids systems components	35,042		39,542
Finished goods - mats	20,265		10,992
Total inventories	$	177,973	$	196,897

Raw materials for the Fluids Systems segment consists primarily of barite, chemicals, and other additives that are consumed in the production of our fluids systems. Raw materials for the Mats and Integrated Services segment consists primarily of resins, chemicals, and other materials used to manufacture composite mats, as well as materials that are consumed in providing spill containment and other services to our customers. Our blended fluids systems components consist of base fluid systems that have been either mixed internally at our blending facilities or purchased from third-party vendors. These base fluid systems require raw materials to be added, as needed to meet specified customer requirements.

Fluids Systems segment cost of revenues includes a total of $9.0 million of charges for the first half of 2020 for inventory write-downs, primarily attributable to the reduction in carrying values of certain inventory to their net realizable value.