Manufactured using advanced molded polymers and highest quality construction. Perfectly balanced to eliminate vibration and provide superior finishing. Allows for excellent dust extraction when paired with vacuum sander setup and sandpaper. Backing Pad 3" x 4" x 8 mm (W x L x H) with 29 holes is suitable for Mirka® DEOS 3" x 4" electric orbital sander. Grip attachment and medium firmness.