Some common amounts of dro for sale.
1g - G
3.5g - Eighth (1/8 oz)
7g - Quarter (1/4 oz)
14g - Half O (1/2 oz)
28g - Zip (1 oz)
16oz - Pound (16 oz)
Any more than that, you best know what you're doing.
ex.) My guy is moving a couple zips a day cuz im pushing almost a zip every night.
ex.)Hahaha this punk just bought 3 g's when he coulda got .5g free. Gotta know you're weed measurements, so you dont do stupid sht.