Mirror finished Stainless Steel body. Internally threaded to accommodate one 16mm diameter blue polypropylene ball and one 16mm diameter black Polypropylene ball. All barbells bodies are internally threaded and each ball is studded and given a flat surface to match the gauge of the barbell body. These go through several machining process which then end with polishing to a mirror finish and a thorough quality check. We believe our barbells have the best quality on the market. Gauge: 10mm (00g) Lengths available: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm 16mm. Ball diameter: 16mm Product Care Due to the material of the ball being softer than the steel studding, care should be taken not to over-tighten on assembly Care should be taken when purchasing our items due to the nature of the products and the intimacy. We offer many different sizes with a lot of our products, so please take care when choosing. Please note: there may be a handling charge or custom fees on the parcel depending on country of destination. Returns Our items are packed in a quick seal transparent bag for protection and presentation. Care should be taken when ordering to ensure correct product and product size is specified. Due to hygiene reasons and the intimate nature of our products, returns/refunds can only be given if there is a manufacturing defect or the seal remains intact.