Add a playful pop of color to your look with these trefoil shaped hoop earrings. of color to your look. These vibrant green, trefoil-shaped hoops are made from lightweight plastic, making them comfortable and easy to wear all day long. Plastic and silvertone backs. Material: 90% acrylic, 7% stainless steel, and 3% sillicone. 2 1/8” H x 2 ¼” W x 1/8” D.