15mm 헤가 사운딩 로드로 소리내기

• 00:04
• 00:29
• 00:53
• 01:18
• 01:42
• 02:06
• 02:31
• 02:55
• 03:20
• 03:44

Sounding and stretching with a 15/16 Hegar sounding rod.