Inventories

Inventories consisted of the following:



(In thousands)	March 31, 2017		December 31, 2016
Raw materials:
Drilling fluids	$	113,518	$	115,399
Mats	1,252		1,137
Total raw materials	114,770		116,536
Blended drilling fluids components	26,472		23,762
Finished goods - mats	4,142		3,314
Total inventory	$	145,384	$	143,612

Raw materials consist primarily of barite, chemicals, and other additives that are consumed in the production of our drilling fluid systems. Our blended drilling fluids components consist of base drilling fluid systems that have been either mixed internally at our mixing plants or purchased from third-party vendors. These base systems require raw materials to be added, as required to meet specified customer requirements.