Serinity 2400 Square hotfix flatback crystals in Crystal are Austrian-made crystals. Available in 2mm, 3mm, 4mm and 6mm in retail packs of 20 and wholesale packs of 144, 720 and 1440. Crystal is a clear colourless rhinestone that reflects all wavelengths of light equally, producing a bright white sparkle suited to any colour palette. Suited to nail art, bridal accessories, dancewear, cheer uniforms, costume design and fashion embellishment. About the Serinity 2400 Square Flatback The Serinity 2400 Square is a square flatback with four equal sides and a faceted table, suited to grid layouts and structured geometric patterns. Hotfix crystals carry a factory-applied heat-sensitive adhesive on the reverse, bonding permanently to fabric, felt and foam with a hotfix applicator or wax-tip pick up tool. No separate adhesive is needed, giving clean and consistent placement every time. Serinity, Made in Austria and Finished in the UK Serinity is Bluestreak Crystals' own crystal brand. The crystals are manufactured in Austria, then quality-checked and packaged at our UK facility. Every order is dispatched the same or next business day, in retail and wholesale pack sizes. Browse the full range of Serinity hotfix flatback crystals or explore our complete Serinity collection.