I purchased the SOUND IN CONTROL ultimate earplugs from Amazon for 999 yen, advertised as sound-blocking and good for naps, but I'm unlikely to use them, so I'm putting them up for sale. They are made overseas, but come with instructions. Spare pieces are included. I've already significantly lowered the price. This is my final price reduction, as it includes shipping, and I'm selling at a loss. Immediate purchase is OK.