With the spacer rings, you can easily replace your standard factory speakers with high-quality speakers from the common brands. Thanks to the sturdy construction, our MDF rings guarantee the best sound quality of the speaker. We do not impregnate our rings during the production process as this would make future work more difficult. We recommend impregnating the rings to protect them from moisture after assembly. For this purpose, we recommend the use of thin wood preservatives, underbody protection spray or silicone.