Eye-catching random color patterns on top of the highly successful Softies? design put SparkPlugs? first in line. Extra-soft foam provides a comfortable no-pressure fit. Form-fitting, tapered bullet ensures excellent attenuation. PVC-free. Corded/Cordless: Corded; Shape: Bullet; Material(s): Foam/Plastic; Noise Reduction Rate (NRR): 33 dB.