These port tubes contribute significantly to the low frequency output. Used for improved speaker cabinet, portable speaker, home speaker or car speaker. Give your speaker a appearance with these attractive port tubes. Features - Color: Black. - Size: 7.90X5.80X5.80cm/3.10X2.28X2.28 inch. - Material: ABS. - Speaker port tube is used to improve the bass response of many types of speakers. - These port tubes are a reliable, convenient installation, while at the same time providing a finished look to your speaker building project. - Normal tubes suffer from nasty turbulence at the entrance and exit of the port, producing unwanted noise and poor sound . - These port tubes can overcome the situations and you can experience good looks, low distortion, and overall sound . - Standard mount holes make this tube easier to install than others on the market. Package list: 8 x Speaker Port Tubes