Investment casting is material efficient, generating far less waste than wrought processes. This becomes increasingly important when using costly alloys. Also, the process is accurate. Dimensional tolerances of ± 0.003 in./in. are readily achieved. This tolerance is critical on parts such as turbocharger compressor wheels that spin at speeds greater than 200,000 rpm and have to be finely balanced. Finally, delicate parts with walls as thin as 0.025 in. can be investment cast.