HABICRAFT ROUND BUDGET ELASTIC. Available in widths 3mm, 2mm, 1.5mm and 1mm. Whole Roll Lengths (1mm = 100m) (1.5mm = 100m) (2mm = 50m) (3mm = 50m). Thin Round Elastic. Thin Fine Round Elastic. This is a strong, thin round hat elastic manufactured from polyester yarn and natural extruded rubber.