At the height of it's trajectory an internal time fuse ignites the burst charge which breaks open the shell casing and ignites the effects. They usually have a plastic base for mounting on a firm level surface. Wheels - designed to be attached to a support such as a post or tall ladder. Then spin at high speed creating a colourful circular shower of sparks. Many wheels also include sirens.
Fountains offer long-lasting displays, beautiful colours and unusual effects.
Cones are placed on the ground, some fountains have plastic bases, others are tubes that are to be buried. Usually mounted with a plastic base. They are especially effective to use as part of a finale. Strobes - produce repeating flashes of intensely bright light. Even though the sparks they produce are fairly tame in themselves, the burning tip is intensely hot and can burn through clothing and cause a bad burn in a fraction of a second.