Used in phase I, the RPE widens the arch during fixed procedures and can include a tongue crib for thumb and tongue habits. Available in 7mm and 11mm, our standard model uses the 11mm Leone expander with welded lingual wires to premolars or cuspids. Made from biomedical stainless steel, its smooth design aids hygiene. Each RPE comes with a swivel key with an activation tracker. Tip: Use warm water for easier turning.