Yoko Kobayashi Kimono Academy - Bias Han-eri (collar lining), Collar Core This item was found in a storage room at home. I am not familiar with collars, so I don't know the details, but one side of the collar core is shorter than the other, so it was probably used. As for the han-eri, one of the three feels thinner than the other two, so it may have been partially used. We appreciate your understanding and acceptance of the above description before purchasing.