Silk

Silk is an item popularly acquired by thieves, requiring level 20 thieving to steal from the silk stall. The most popular place for stealing silk is ardougne. It is usually sold by players in busy worlds for 1400-1500 per 27, and then sold to the merchant for 1680 per 27 (60 gp each) as players are not allowed to resell stolen goods. The silk trade is a great way to make pure profit.