This is a great fretting starter kit for cigar box guitars, designed to help you make sure your first fretting attempt is a successful one! This kit includes a great 39-page guide to fretting basics on CD, as well as 6 feet of medium nickel-silver fret wire that you can use for your first fret job! We have sold hundreds of these fretting guides and have received hundreds of positive feedback on how helpful it was!As for the fret wire, this kit includes six feet of beautiful, durable 18% nickel-silver fret wire, in handy straight 8-inch lengths. This fret wire is identical to Stewart-MacDonald"s #148 "Medium/Medium" fret wire - a perfect size for CBGs.The fret wire dimensions are as follows: Size Specs: Crown Width: .084" (2.13mm) Crown Height: .039" (0.99mm) Tang Depth: .055" (1.40mm). Recommended Tang Width: .023"