RG0058AL Metalloid Chrome Sanjuro Clear LensDESCRIPTION RIGARDS 2021Spring Summer Collection. Boston type aluminium frame. This is a tasteful eyewear that has a simple shape but the shade changes complicatedly depending on how the light hits by the hairline (Sanjuro) treatment applied to the entire exterior including the temple. Although it has a full metal rim, the nose pad is designed to suit Japanese people, and the fitting feel of the flexible temple joint makes it lighter than aluminium