18" (45cm) is the size that gives a garland its shape. A few 18s placed along the line break up the rhythm of the 12s and make the whole install look fuller and more professional. They're also the go-to for helium bouquets where a 12" looks too small, and for ceiling installs that need presence. Every Stylex colour comes in 18" — matched exactly to the 5", 12" and 36".
Sold in packs of 25 or 50 depending on the shade (pack size is in each product name). Helium-grade: expect roughly 12–18 hours of float untreated, longer with a float treatment. The thicker latex at this size shows colour richer and deeper than a 12" — Deep Red, Hunter Green and Navy in particular look their best in 18".
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Building a garland? Read our guide: how to build an organic balloon garland — sizes, counts per metre and the order to inflate them.
More guides: helium float times by size and choosing balloon sizes for organic decor.
Questions stylists ask
How many 18" in a garland?
Roughly 2–3 per metre, spaced unevenly. Too many and it stops looking organic.
18" or 24" for the statement balloons?
18" for a standard garland. Step up to 24" (60cm) on arches and backdrops over 3 metres where the 18s start to look small.
How much helium does an 18" take?
About 0.4 cubic feet (11 litres) — roughly four times a 12".