Audio Technica ATH-M50-ADAPTER - Factory replacement 1/8 inch to 1/4 inch threaded adapter for ATH-M50 and ATH-M50s (not for ATH-M50x). ATH-M50 -ADAPTER
私の持ってるヘッドホン、audio technica ATH-M50!! - 鈴ノ森守☆ブログ
ATH-M50 - Professional Studio Monitor Headphones (with coiled cable) | Audio-Technica