Come and see our amazing products. The retainer case is made of PP, strong and durable plastic will not crack or break, long lasting use. Holes on the case keeps it well ventilated and your oral appliance dry,clean and free from collecting odor. Customized logos are welcome. 3.3" L x 3.1" W x 1.1" H Pls confirm with us about the packing info, stock color and exact production time before placing your order