The Small Bell (I402) is a single Montessori bell used in the sensorial bells work for the 3–6 environment, appropriate for pairing, grading, and matching activities that develop a child's sense of pitch and auditory discrimination. Unlike a full bells set, a single replacement or supplemental bell is useful when you need to retire a damaged bell from an existing set or build a pairing extension with a second set. Having clean, well-tuned individual bells on hand keeps your bells work accurate and prevents children from developing false pitch associations.