... color clear 2.very smoothy ,can't see any track bronze aluminum extrusions ,matte surface ,mechanical polishedFeatures: 1. Alloy ... 6063 or 6061 2. Polish extrusions color : Silver, champagne, bronze, golden ,etc.3. mechanical polishing of extrusions : Firstly cancle rude ... surface very soomth without any track ,brighter than common anodised .5.produce standard of aluminum extrusions : GB/T 5237-2004. ...