Features: Increases the volume of the speaker without increasing its power. Perfectly replaces old or damaged sound guide tubes, enhances volume, and improves speaker efficiency. Standard mounting holes allow for easy and secure installation. Enjoy clear audio with low distortion and improved overall sound quality. Brand . Special curved inverting tube designed for sound boxes, made from ABS plastic material. Specifications: Item: Special Inverting Tube for Sound Box Size: S / M / L Open Hole Diameter: approx S: 50mm (1.97in), M: 64mm (2.52in), L: 79mm (3.11in) Length: approx S: 98mm (3.86in), M: 125mm (4.92in), L: 176mm (6.93in) Sized to fit various speaker drivers: - Small (50mm): compatible with 5-inch and 6.5-inch speakers - Medium (64mm): compatible with 6.5-inch and 8-inch speakers - Large (79mm): compatible with 8-inch and 10-inch speakers Quantity: 1 piece Package Includes: 1 x Curved Speaker Port Tube (speaker not included) Note: Color may vary slightly due to lighting and shooting angles. Size may vary slightly due to manual measurement.