Features:<br> 43mm length tube is suitable for 2-4in compact speaker.<br> 93mm length tube is suitable for 5-6.5in compact speaker.<br> 105mm length tube is suitable for 8in compact speaker.<br> 123mm length tube is suitable for 8in compact speaker.<br> Made of high quality ABS plastic, this product is sturdy and durable.<br> The speaker port, also known as the sound tube and the air hole, is often used in the ported speaker.<br> It mainly suppresses the airflow sound of the speaker in the box and overlaps the sound pressure radiated in front of the speaker to produce a effect.<br> <br> Specifications:<br> Material:ABS<br> Color:Black<br> Length:43mm/1.7in,93mm/3.66in,105mm/4.13in,123mm/4.84in,(Optional)<br> <br> Note:<br> Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. <br> Due to the difference between different monitors, the picture may not reflect the actual color of the item.<br> <br> Package includes:<br> 2x Speaker Inverter Tubes