Patented equipment Audio system sound quality improvement components Wind Bell OS-25 Black

[Quantity] 4 pieces [Loaded weight] ~25 kg/4 pieces [External dimensions] Φ50 x 30 mm [Color] Black [Weight] 35 g/1 piece [Accessories] 4 M6 screws, 1 hex wrench, M6, 4 M8 conversion screws [Recommended installation] Subwoofer, preamplifier, power amplifier