The first thing to know about pre-rolls is that they come in two types: joint and blunt wraps. Joint wraps are made of paper or hemp and blunt wraps are made of tobacco leaf. The next thing to know is that pre-rolls come in different sizes depending on how much weed you want to pack in them. Joint wraps usually have 1 gram while blunt wraps usually have 2 grams. Pre-rolls also come with different brands and flavors which can be added for an extra cost.