Pinlock Earplugs provide the best audio cancelling between the bands of 1kHz and 2kHz - This will protect you against wind and helmet-generated noise and substantially lower the onset of ear fatigue which can contribute to a sense of drowsiness when on the road. NOT only that, the Pinlock design allows air-flow into the ear canal minimizing irritation, build-up of hot air and the feeling of obstruction in the ears unlike other products on the market. 100% developed and manufactured in the Netherlands and individually tested using the latest in sound technology, all giving you confidence your ears are being well looked after! Features - Includes 2 filters (Red inserts), 2 medium earplugs and 2 large earplugs , Robust & reusable with fully washable tips and filters. , Easy to follow instructions , Non toxic & Silicone Free , Complete with ear plug case with key and card holder , Noise reduction rate up to 24 DB (ANSI and ECE certified), , Does NOT affect the balance of the motorcyclist ,