RedRock Starter Block PRO, 4" x 4" x 2.5" (Case of 216) Air Filter The spectrum is comprised of

The spectrum is comprised of 410

produces a noise level of 30 Dba and has dual ball bearings

Providing first-class humidity control

The trim tray is made with quality materials and ingenuity

Quick and tool-free assembly

RedRock Starter Block PRO, 4" x 4" x 2.5" (Case of 216) Air Filter The spectrum is comprised ofRedRock Starter Block PRO, 4" x 4" x 2. 5" (Case of 216) 42 40 Hole 10x10x6. 5cm 4 Inch x 4 Inch x 2. 5 Inch Commercial grade stone wool pro starter blocks sourced and manufactured in North America. Our Stone wool starter blocks are made in the USA and processed in Canada Wetting agent ensures nutrients are immediately plant available The high fiber density of the stone wool starter blocks makes better use of water and fertilizers while allowing dry