Specification Brand : SANWA BulletPoint1 : 【Fit in 44mm Trackball Mouse】- This replacement ball is designed for any trackball mouse using a 44mm/1.73 inch trackball. Compatible with models like SANWA: GMAWBTTB138N, GMATB137; ELECOM: DEFT PRO (M-XPT1MRXBK), DEFT Series(M-DT2URBK); Protoarc EM03, Nulea M511, M505A etc. Note: This ball is Not suitable for Trackman T-RB22 mouse (which uses 43mm/1.69" ball). BulletPoint2 : 【Work with Optical Sensor】-This replacement trackball provides excellent optical sensors sensitivity. Comfortable for finger control and ensures a smooth & agile movement. Specialized in precise pointing, multi-screen work, file works, excel, data processing, and efficiency improvement. BulletPoint3 : 【How to Remove the Ball】- This SANWA trackball replacement can be easily removed from the mouse bottom using your finger or a pen. BulletPoint4 : 【Glossy Black Color】- Its surface is painted with a scratch-resistant coating and glossy black color for more effortless optical identification and smooth movement. Works Temperature: -40℃ to 60℃. BulletPoint5 : 【Quick Cleaning Tips】- This mouse ball replacement part is simple to clean. Either use a soft brush or a lint-free fabric. Before replacement, we suggest that you can clean the inside ball hole to avoid possible erratic cursor movement. ButtonQuantity : 11 Color : Black CompatibleDevices : Personal Computer CompatibleDevices1 : Trackball Mouse CompatibleDevices2 : MX Ergo, M570, M575, MX Ergo Plus; ELECOM: EX-G Pro(M-XPT1MRXBK), EX-G; Kensington: TB450, TB550, Pro Fit Ergo(K75326WW), Perixx: PERIPRO-801, Perimice-517 / 717 / 520 / 720; SANWA: GMATB128BK, GMAWTB129BK, GMABTTB130BK, GMATB167, GMAWTB168, GMABTTB169, GMATB155, GMATB44BKN/RN, GMABTTB1BK CompatibleDevices3 : MacBook Pro 14 Inch M4 M3 M2 M1 Pro / Max A3112 A3401 A3185 A2442 A2779 A2918 A2992 CompatibleDevices4 : MacBook Pro 16 inch M4 M3 M2 M1 Pro / Max A3403 A3186 A2485 A2780 A2991 ConnectivityTechnology : USB ExternallyAssignedProductIdentifier : 6972349547468 ExternallyAssignedProductIdentifier1 : 4049571004150 ExternallyAssignedProductIdentifier2 : 04049571004150 FinishType : Glossy GpsrSafetyAttestation : 1 HandOrientation : Ambidextrous HardwarePlatform : PC HardwarePlatform1 : Laptop HardwarePlatform2 : Personal computer IncludedComponents : Trackball ItemName : SANWA Trackball 44mm/1.73in, Replacement Ball GMAWBTTB138N/GMATB137, ELECOM DEFT/DEFT PRO, and Other Compatible Trackball Mouse, Glossy Black ItemPackageDimensions_Height : 5.4102 centimeters ItemPackageDimensions_Length : 5.0038 centimeters ItemPackageDimensions_Width : 5.4102 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : computer-trackballs Manufacturer : SANWA SUPPLY Material : Plastic ModelName : GBALL44BK ModelNumber : GBALL44BK MovementDetectionTechnology : Trackball NumberOfItems : 1 NumberOfLithiumMetalCells : 1 OperatingSystem : Windows PackageLevel : unit PartNumber : 18054 Pattern : Solid PowerSourceType : Battery Powered ProductDescription : SANWA Trackball 44mm/1.73in, Replacement Ball for SANWA GMAWBTTB138N/GMATB137, ELECOM DEFT/DEFT PRO, and Other Compatible Trackball Mouse, Glossy Black ProductSiteLaunchDate : 2025-03-18T05:53:46.289Z Range : 6.0 meters RecommendedUsesForProduct : Office Size : 44 MM Style : Modern SupplierDeclaredDgHzRegulation : not_applicable Theme : Computer accessories, Trackball mice UnitCount : 1 UnspscCode : 43211708 WarrantyDescription : 1 year