Check the listing for details. 5 pack: Easy Kerves The Kerf Port Alternative Stack Fab Curved Speaker box Rings. Condition: New. Listed at 12.99 USD. 5 Pack: A quantity of 1 equals 5x 0.75" stacks. The total height of 5x 0.75" is 3.75" (inches) tall. Example: If your port wall is 15" (inches) tall, you will need to order a quantity of 4, which will be 20 stacks total. 20 x 0.75" (inch) = 15"Please order accordingly based off of the height that you need.Welcome To Easy Kerves, the Kerf Alternative. Select your size: FREE SHIPPINGThese stack fab parts will easily allow you to add kerves to any corners of your projects. Weather you want a kerved style port on your vented enclosure, or have a complx underseat enclosure design, our Easy Kerves will make things much easier to get those kerved results.Precision CNC cut out of 0.75" high quality MDF.Each peice stack is 0.75" thick *Example, if your port is 15" tall, you will need a 20 pack. Available in a wide variety of sizes with an external radius of "3, 4", 5", 6", 7", and 8" Easy Kerves The Kerf Port Alternative Stack Fab Curved Speaker box Rings