Pre-rolled joints are rolled with light, somewhat translucent papers, often referred to as rolling papers. They also usually feature a paper filter, often referred to as a crutch, that helps stabilize the joint and keep the joint from getting too hot to handle.
Pre-rolled blunts are rolled with dark brown tobacco paper, which is much thicker than rolling papers. The tobacco paper provides you with a little bit of a tobacco buzz along with a cannabis high, creating what blunt fans find to be an alluring and effective combination. Blunts do not feature a filter and tend to be larger in size than a joint.