Hat stretcher has Two SizeSmall Size Available From 6 1116 to 8 78 Large Size Available From 7 14 to 9 78Small Size choose 6 12Large Size choose 7 14 Three Colors of Thread Rod AvailableBlack Red Blue Stretch Hats Back To Their Original Size There is no splintery edge on any side which may hurt you or your hat Works on any hat which has soft material