PME Brand tips have no seams, and are geared toward doing fine work.
Stainless steel construction.
Scroll below for tips available.
Each tip is sold by the each. All are standard sized.

PME Supatube Tips
Tip #ST0 PME #0 Writer, Fine Round $4.95 13G-43-ST0
Tip #ST2 PME #2 Writer, SmallRound $4.95 13G-43-ST2
Tip #ST17 PME Figure Tipe, 6mm Round Hole $4.95 13G-43-ST17
Tip #ST5 PME #5 Star $4.95 13G-43-ST5
Tip #ST7 PME #7 Star $4.95 13G-43-ST7
Tip #ST8 PME #8 Closed Star $4.95 13G-43-ST8
Tip #ST32R PME Medium Ribbon $4.95 13G-43-ST32R
Tip #ST57S PME Straight Petal, Ambidextrous $4.95 13G-43-ST57S
Tip #ST19B PME Small Basketweave $4.95 13G-43-ST17
Tip #ST44 PME Rope, Fine Star $4.95 13G-43-ST5
Tip #ST52 PME Large Leaf $4.95 13G-43-ST52