The Glow in the Dark Silicone Buckle Couple Bracelets are heart-shaped bangles made of silicone, featuring a buckle closure for easy adjustment. The bracelets come in a set of black and pink colors, and they are adjustable in size from 16-21cm. The unique feature of these bracelets is that they glow in the dark, adding a fun and romantic touch to the love-themed jewelry. Perfect for couples looking for a stylish and adjustable accessory to wear together.