Jewelry CASTING POWDER LOST WAX CASTING OF JEWELRY 5 Lbs CLASSIC SRS INVESTMENT (LZ 5.10 R BOX A) NOVELTOOLS LOST WAX CASTING INVESTMENT JEWELRY CASTING POWDER SRS CLASSIC CASTING POWDER FOR Gold & Silver Casting Investment Powder for Jewelry Castings 5 Pound Box, CLASSIC is made by SRS. A 5 Pound box of the casting powder CLASSIC uses the highest quality specially graded raw materials all checked against specification by the SRS QC laboratory. It is ideal for casting in Gold and Silver