Jim Dunlop "Moonshine" ceramic slide. Individually hand formed to withstand years of regular use. Gives a rich, resonant tone. Porous interior absorbs finger moisture to reduce slipping. Heavy wall. Medium size suits ring size 6.5-7. Dimensions: 17mm x 27mm x 70mm Large size suits ring size 7.5-9. Dimensions: 19mm x 32mm x 70mm Extra large size suits ring size 13. Dimensions: 21x5.5x70mm.