Sizes: SS10 (2.8-2.9mm)SS16 (3.8-4.0mm)SS20 (4.6-4.8mm)SS30 (6.32-6.5mm)SS34 (7.1mm)SS40 (8.5mm) Quantities Available:ss10 - ss20: 1gross (approx 144)ss10 - ss20: 10gross (approx 1440)ss30: 1/2gross (approx 72)ss34: 50 piecesss40 50 pieces Our Hot Fix AAA+ Flatback Diamante Rhinestone Crystals are a Czech quality Rhinestone. Melbourne Dance Depot's 14 faceted, machine cut Hot Fix Rhinestones are highly effective and a very cost effective way to add sparkle and glamour to a wide range of fabrics and surfaces. Hot Fix Flatback Diamante Rhinestones can be applied with a hot fix applicator, pre-testing on your desired fabric is highly advised. How to apply the Hot Fix Flatback Diamante Rhinestone crystals. Hot Fix crystals can be easily applied using a hot fix tool or iron. Make sure to use a layer of card or board sandwiched between front and back of garment to prevent glue adhering to both layers.