Direct materials cost
Direct materials cost  the cost of direct materials which can be easily identified with the unit of production. For example, the cost of glass is a direct materials cost in light bulb manufacturing. The manufacture of products or goods required material as the prime element. In general, these materials are divided into two categories. These categories are direct materials and indirect materials. Direct materials are also called productive materials, raw materials, raw stock, stores and only materials without any descriptive title. See also
Variance analysis (accounting)
Direct material total variance
Direct material price variance
Direct material usage variance

References 

Costs