Specification Brand : INON BulletPoint : Sea and Sea Sea Arm 8 Strobe Head Mount for Underwater Photography BulletPoint1 : Inon top end arms for underwater photography carrying high texture and durability by machined aluminum alloy with integral ball-joints. BulletPoint2 : Full length: 5.7" (144mm) BulletPoint3 : Effective length: 4.7" (120mm) BulletPoint4 : Weight: 2.1 oz (60g) [air] / approx.1.4 oz (40g) [underwater] BulletPoint5 : Arm S ConnectivityTechnology : Usb ExternallyAssignedProductIdentifier : 4562121430891 ExternallyAssignedProductIdentifier1 : 0628586410244 ExternallyAssignedProductIdentifier2 : 628586410244 ItemName : Inon Arms for Underwater Photography - S ItemPackageDimensions_Height : 2.8 centimeters ItemPackageDimensions_Length : 3.8 centimeters ItemPackageDimensions_Width : 17.4 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : underwater-lighting-parts-and-accessories Manufacturer : Inon Material : Aluminum ModelNumber : LYSB004QQ293K-ELECTRNCS NumberOfItems : 1 PartNumber : 4562121430891 Pattern : Solid ProductDescription : Inon top end arms for underwater photography carrying high texture and durability by machined aluminum alloy with integral ball-joints. Four different lengths of Inon Arm products are available: Arm SS: Full length: 5.7" (144mm) Effective length: 4.7" (120mm) Weight: 2.1 oz (60g) [air] / approx.1.4 oz (40g) [underwater] Arm S Full length: 6.9" (174mm) Effective length: 5.9" (150mm) Weight: 2.5 oz (70g) [air] / approx. 1.6 oz (44g) [underwater] Arm M Full length: 8.8" (224mm) Effective length: 7.9" (200mm) Weight: 3.0 oz (85g) [air] / approx. 1.8 oz (52g) [underwater] Arm L Full length: 13.5" (344mm) Effective length: 12.6" (320mm) Weight: 4.2 oz (120g) [air] / approx. 2.6 oz (74g) [underwater]