Silicone earring backs, 300 pieces, bulk sale. Flower-shaped, double-lock type, making earrings less likely to fall out and providing stability. Can be used with both resin and metal posts. - Material: Silicone - Color: Clear (transparent) - Type: Flower-shaped, double-lock - Quantity: 300 pieces New and unused, but due to being overseas-made parts, there may be some individual differences or small scratches. Please purchase only if you understand this as a handmade material. Recommended for earring making, handmade sales, and as a stock of spare backs. Instant purchase OK. No individual sales due to bulk sale.