eXotic Alloy 6061 Headset Spacer Set for 1 In Steerer 6 x Pcs Spacers - 6 Piece Set 3 x 3mm (2.9 gm each) 1 x 5mm (4.1 gm) 1 x 8mm (5.6 gm) 1 x 10mm (7.0 gm)