Dyson Diffuser - new, never used, metallic gray, fits supersonic hairdryer Even diffusion for defined curls and waves. Long prongs reach deep into hair. $39.99 Diffuser for defined curls and waves Re-engineered to disperse air more evenly around your curls, the Diffuser simulates natural drying, helping to reduce frizz and define curls and waves. Longer prongs allow you to style more hair with greater control – and reach deeper into the hair.