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. PlugStation Dispenser. Corded/Cordless: Cordless; Shape: Bullet; Material(s): Foam; Noise Reduction Rate (NRR): 33 dB.