For Seiko Mods, solid 316L stainless steel units plus highlighted 3D effect curved solid end pieces was designed to fit Seiko 63Mas 40.5mm models SPB143, SPB145, SPB147, SPB149, SBDC101, SBDC103, SBDC105, SBDC107, the interpretations of Seiko's First 62MAS models. These well-built replacement watch bands was assembled by screw-in adjustable details.