Tinksky Unisex Adult Graduation Cap with Tassel Adjustable (Black Blue) This is Adjustable Student Mortar Board Black Graduation Cap with Blue Tassel Adult Graduation Party Hat Fancy Dress Accessory. Color: Black, blue. Material: Durable polyester. Board size: Approx. 24 * 24cm. Head circumference: Adjustable. The mortar board is decorated with a nice tassel. A hat for college graduation, school disco or other occasions. Great accessory for your costume.