• Material：ABS plastic
• Baffle cutout diameter：82mm 
• Size ：Ф91mm（Mouth outer hole diameter）x110mm (long) ,Mouth inner hole diameter:58mm,2pcs/lot
• Bottom outer hole diameter:72mm
• ABS plastic is sturdy and lightweight.The Bass Tube can Increase the bass response of your system,Recommend for 6.5-8 inch speaker.