Offering bowls serve as vessels on the altar for holding all sorts of items, most commonly an edible dry offering (crackers, bread, etc...) to the God and Goddess. Many people use bowls on the altar to hold sage and other herbs, crystals and gems, prayer beads, and other sacred items. They add beauty to the altar while serving a practical purpose.
Ritual bells are used to cleanse the sacred space using sound prior to ritual. Bells are also used to signal the beginning and end of a meditation. The pure tone of a bell ringing is said to rid one's self and ritual items and space of negativity. Many people will also chime a bell prior to Tarot or oracle readings.