Firstclass is a modern hybrid-sativa cultivar derived from genetics originating from Mountain Temple. It is a moderately difficult strain to cultivate, requiring a flowering period of 70 days to reach maturity. Designed for both indoor and outdoor environments, the plants are recognized for their high yields, making them a productive choice for cultivators. The strain has served as a primary genetic foundation for further development, including notable offspring such as C-Class '99 and the Firstclass F2 line.

The terpene profile of Firstclass is complex and diverse, led by a dominant concentration of myrcene, followed by caryophyllene and ocimene. The secondary and tertiary tiers consist of nerolidol, linalool, limonene, pinene, humulene, and guaiol, with trace amounts of bisabolol, eucalyptol, beta-pinene, p-cymene, caryophyllene-oxide, terpinolene, camphene, isopulegol, valencene, borneol, sabinene, and gamma-terpinene. This chemical composition shapes the sensory profile, resulting in a multifaceted aroma and flavor derived from this extensive range of compounds.

As a THC-dominant cultivar, Firstclass is characterized by effects that are primarily creative, uplifted, and euphoric. These properties make the strain particularly well-suited for activities requiring enhanced focus, social engagement, and artistic inspiration. Its functional effect profile and reliable genetic productivity account for its significance in contemporary breeding programs.