Correction: Copenhagen snuff (fine cut, moist) is sold in 1.2 oz (34 g) cans. Copenhagen long cut is sold in 1.2 oz (34 g) cans as well. The 0.5 oz size is for pouches (e.g., Copenhagen Pouches).
Nicotine content (per manufacturer, Altria):
Health Warning: Smokeless tobacco causes oral, esophageal, pancreatic cancer; gum disease; nicotine addiction. Not a safe alternative to smoking.