Part ID: 4210900 Design ID: 30377 Part Name: Space Skeleton Arm Category: Figure Accessories, Upper And Lower Part Colour: Dark Stone Grey More details...
Part ID: 4211658 Design ID: 30377 Part Name: Space Skeleon Arm Category: Figure Accessories, Upper And Lower Part Colour: Medium Stone Grey More details...
Part names, colours and categories are based on LEGO's parts classification, not BrickLink's.
The information is based on data obtained from LEGO's replacement parts system which does not contain inventories for every set, and those which it does have are often incomplete.
