Let me start by saying these skull vent clips are undeniably cool. The three-pack of 'see no evil, hear no evil, speak no evil' skulls adds a fun gothic touch to my car's interior. The resin material feels durable, and the clip mechanism holds securely to my vents - no worries about them falling off during bumpy rides.

Where these fall short is their primary function as air fresheners. Despite coming with cotton pads for adding scents, the design lacks proper ventilation. I've tried multiple essential oils, but the fragrance barely disperses. They're essentially decorative pieces that happen to hold scented pads.

The clips work great as conversation starters though. Friends always comment on them when they ride in my car. I particularly like how you can personalize them with your favorite scents (even if they don't diffuse well). The included extra pads are a nice touch for when you want to change fragrances.

Installation couldn't be simpler - just clip onto any standard car vent. The skulls stay firmly in place, and the 2.36x1.2 inch size is perfect - noticeable but not obtrusive. They make excellent gifts for anyone who appreciates edgy car accessories.

While I wish they functioned better as actual air fresheners, I'm keeping them for their aesthetic appeal alone. Just don't buy these expecting strong fragrance diffusion - you'll be disappointed. As decorative pieces with potential for light scenting, they're a fun addition to any vehicle.