Rainbow Iris Fluorescent Matte Opaque Back Reversible Sequins have an iridescent finish and will glow under a black light. Size and Pack Specifications: 12mm is approximately 1/2 inch. 150 sequins per pack. Hole location: Top Incredible sequins and paillettes. Made in USA. Great for sewers, costumers, displays, studio, theatrical productions, earrings, arts and embellishments. Can be used for pendants, earrings, fabric embellishment, home décor, decorative arts. Rainbow Iris Fluorescent Matte Opaque Back Reversible Sequins have an iridescent finish and will glow under a black light. Size and Pack Specifications: 12mm is approximately 1/2 inch. 150 sequins per pack. Hole location: Top Incredible sequins and paillettes. Made in USA. Great for sewers, costumers, displays, studio, theatrical productions, earrings, arts and embellishments. Can be used for pendants, earrings, fabric embellishment, home décor, decorative arts.