Which of the following is used for rolling pre-made joints?

The correct answer is that cones are specifically designed for rolling pre-made joints. Cones are pre-formed paper structures that taper to a point, allowing users to fill them with ground cannabis or other substances easily. This design simplifies the process of joint rolling and ensures a consistent shape, making it a popular choice for both amateurs and experienced users.

Roach clips are used to hold the ends of joints that have been smoked down to a small size, allowing users to enjoy the entirety of the joint without getting burned. Deodorizers are products designed to mask or eliminate odors, particularly useful in contexts where cannabis use might be encountered but not directly involved with the rolling process. Pipes are tools for smoking substances but do not facilitate the rolling of joints, as they are used for inhalation rather than for preparing cannabis as a joint.