K&N filters are constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16" (1.5mm) to fit in-between sizes.

K&N universal air filters are washable and reusable.

Part RE-0870 Pod Filter Specifications
Base Outside Diameter: 6 in (152 mm)
Flange Inside Diameter: 4 in (102 mm)
Flange Length: 1.75 in (44 mm)
Flange Type: Centered
Height: 9 in (229 mm)
Top Outside Diameter: 4.625 in (117 mm)
Top Style: Rubber
Flanges: 1
Weight: 2 lb (0.9 kg)

K&N Air filter wraps are also available see below:
K&N Wrap, Protects Filter from Muddy Conditions (25-0810)
K&N Wrap, Protects Filter from Dusty Conditions (RE-0810PK)