Specifications: Plastic Buckle :Transparent, it can be matched with all kinds of shoulder tapes, good rigidity and environmentally friendly. We can mix various colors according to your requests. Nylon coated Buckle: Good rigidity, non-changeable, environmentally friendly. ※Our Plastic Buckle has successfully passed the inspection of European Union ROHS (SGS) certification and has been granted authorization according to Oeko-Tex Standard 100 to use the Oeko-Tex mark 【CONFIDENCE IN TEXTILES Tested for harmful substances】based on test report SHBO 048763.1 of TESTEX Switzerland. Product function: All these Buckles are used to adjust the bra straps, which are quite convenient for use. Product specifications table : Diameter: 6mm 7mm 8mm 9mm 10mm 12mm 15mm 16mm 18mm We can also offer other specification according to the request.