Four charcoal roasted oolong teas from four different cultivars:

Charcoal Spring - Four Seasons Like Spring Cultivar

Charcoal Golden Lily - Golden Lily Cultivar

Charcoal Jade - Jade Cultivar

Charcoal Pine - Pine Bud Cultivar (developed by fourth generation tea family) 

Charcoal roasting is an art and uses burning charcoal to roast the tea.