Specification Brand : JIAKAI BulletPoint1 : Quantity: 20PCS.Color: black,Material: magnet,plastic BulletPoint2 : Size (LWH): 3.7 inches, 3.1 inches, 0.7 inches BulletPoint3 : with 4 different size 5/ 7/ 9/ 13 mm inner diameter BulletPoint4 : Ferrite core with plastic cover; Helps to reduce EMI on AC power lines BulletPoint5 : Product 2: Filters 12V Car Audio Products That Have Induced Noise From Alternators & Other Ignition Sources BulletPoint6 : Product 2: Designed With The Installer User In Mind BulletPoint7 : Product 2: It Has Secure Fit BulletPoint8 : Product 2: Proven And Tested For Durabilty And Function In Real World Conditions Color : Black CustomerPackageType : Standard Packaging Directions : 1. Roll the earplug between your fingers to compress it. 2. Reach over head with opposite hand and pull outer ear up back straighten canal. 3. Insert into canal while holding it in place finger. 4. Once is place, release should expand fill 5. To remove earplug, gently twist slowly pulling out of ear. ExternallyAssignedProductIdentifier1 : 606321001223 ExternallyAssignedProductIdentifier2 : 0606321001223 FitType : Custom Fit ItemForm : Pair ItemName : Ferrite Ring Core Black RFI EMI Noise Suppressor Cable Clip-20Pcs ItemPackageDimensions_Height : 12.0904 centimeters ItemPackageDimensions_Length : 3.7084 centimeters ItemPackageDimensions_Width : 7.7978 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : electromagnetic-interference-filters Manufacturer : JIAKAI Material : ferrite ModelName : Ferrite Ring Core ModelNumber : LIU-0008 NumberOfItems : 20 NumberOfPieces : 20 PartNumber : LIU-0008 ProductDescription : Function: 1.Reduce electro-magnetic interference and improve signal integrity; 2.Helps reduce EMI on AC power lines; 3.Easy to install with double snap clips ProductSiteLaunchDate : 2018-01-03T08:00:00.000Z RecommendedUsesForProduct : Noise Protection Reusability : Disposable Size : 1 Count (Pack of 20) SpecificUsesForProduct : Noise Protection Style : Noise Protection - Foam UnitCount : 20 UnspscCode : 39121705