Shop › Hinky Dinky Coaster Image 1 of 1 Hinky Dinky Coaster $6.00 Pricie is per coaster.Each coaster is polyester with an open cell black rubber backing. The coaster is 4" Diameter x .22". Quantity: Add To Cart Added! Pricie is per coaster.Each coaster is polyester with an open cell black rubber backing. The coaster is 4" Diameter x .22".