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[Large specifications:
Dial diameter 3.7cm， dial thickness of 0.6cm， strap length 17.5-21.5cm， strap width 1.8cm

[Trumpet specifications:
Dial diameter 3.0cm， dial thickness of 0.6cm， strap length 17.0-21.0cm， strap width 1.5cm
Strap: Leather
Case Material: Alloy