The National Swing-Gate 6 flat shader comes assembled with a stainless steel cut-away 6 flat shader tube and your choice of 8 or 10 wrap 5/16" core coils. The Swing-Gate machine was originally designed by Bob Shaw, one of the most respected tattooists in the profession, who is also known for his expertise in tattooing and tattoo machinery. This machine is designed for easy changing of tubes and needle bars. Approximate weight, without tube: 10 wrap=9 oz. 8 wrap=8 oz.