BONOSS manufactures wheel spacers and adapters in stock with high-grade forged 6061-T6 billet aluminum alloy which features many desirable properties such as high strength, wear-resistance, excellent toughness, impact resistance and high-temperature resistance. This metal performs good mechanical properties: Tensile strength≥310Mpa, Yield strength≥275Mpa and Failure Elongation≈10%. You don’t have to compromise on quality. Those cheap spacers are normally made from low-grade aluminum. They are not strong enough and will be deformed and destroyed under intense impacts, leading to disasters.