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CHSREDS6AD, SPECTRA AD REDS 6/SET. Manufactured by Chartpak. Spectra AD Markers are extremely versatile, featuring a dual-ended tip with a flexible brush tip on one side and the innovative Tri-nib on the other. The AD Marker signature Tri-nib offers three line widths - fine, medium and broad - with just a twist of the wrist. The colors are blendable when wet and dries fast and permanent for superior layering.