Beadslide Elegant Elements Gold Plated 10x18mm PATENT PENDING - APPROXIMATE beads per row for BEADSLIDE? clasps: Bead sizes vary dramatically from brand to brand. Test by stringing beads on a needle and inserting into the tube. Ends should close without pushing against beads. /// 18mm tube: 15/0 round Japanese: 17-18 beads; 11/0 round Japanese: 12 beads; 11/0 round Czech: 13 beads; 8/0 round Japanese: 9 beads; 8/0 Matubo round: 8 beads; Delica 11/0: 12 beads /// 24mm tube: 15/0 round Japanese: 22-23 beads; 11/0 round Japanese: 16 beads; 11/0 round Czech: 18 beads; 8/0 round Japanese: 11-12 beads; 8/0 Matubo round: 9-10; Delica 11/0: 18 beads ///29mm tube: 15/0 round Japanese: 29 beads; 11/0 round Japanese: 21 beads; 11/0 round Czech: 21 beads; 8/0 round Japanese: 15 beads; 8/0 Matubo round: 12 beads; Delica 11/0: 23 beads.