1.GL,LR,ABS,BV,CCS,NK certificate. 2.Material: Alloy,Cu,Ni-Al bronze,Mn-Al bronze 3.Ones warranty.customerizd sized Specifications1.GL,LR,ABS,BV,CCS,NK certificate. 2.Material: Alloy,Cu,Ni-Al bronze,Mn-Al bronze 3.Ones warranty.customerizd sizedFixed Pitch PropellerMaterial: Alloy,Cu,Ni-Al bronze,Mn-Al bronzeSize: as the customers' request. Blade: 3.4.5.6 Certificate: ABS. BV.CCS.DNV.GL.KR.NK.LR. ...