Cover Size: 9.8 x 2 inch / 250 x 50 mm( L x W ); Fit for Install Hole Size: 8.58 x 1.3 inch / 218 x 33 mm. | Material: Aluminum Alloy, durable,rust-proof, anti-rust and anti-oxidation. | Nice for the ventilation of closed spaces,such as cabinet, shoe cabinet, wardrobe. | Package includes 2 Pcs Ventilation Cover + Some Mounting Screws. | Set comes with mounting screws for easy installation.

🎵 Horn Mouthpiece is made of solid and thicken metal, durable, stable, high quality, and Come out with a pretty clear sound. | 🎵 Twinkling and stylish, nice for any beginning players. | 🎵 Gold plated treatment with professional production line for anti-rust, have a long service life to use. | 🎵 Horn Mouthpiece, Overall Length: 2.6"; Shank Diameter:0.25"; Cup Diameter: 1". | 🎵 Professional tuba mouthpiece design can perform rich and elegant sounds.