A model with a new design called double nylon string structure: top bar is placed from closing blocks to bridge to fix both upper and lower nylon strings. Minimal shape that looks rim-less is created with nylon string. Ultrafine temple tips are placed on newly designed β-titanium temples. Metal parts that are covered with temple tips are decorated with millgrain both sides. Unique model is produced with considerations in every detail. Two round shape models, 153 and 154 are available.