There is a protective film on the of the coating, which can protect the printing coating, so that your coating is more protected and the printing image is clearer [Good Material and Size] This sublimation coaster is made of MDF material, size: 3.86x3.86 inches (10x10cm), thickness is 4mm Pressing time: 60-70 seconds Pressing temperature: 355-375F (180-190C) Use sublimation ink, sublimation paper and heat . size: 100 x 100 x 0.4mm Material: MDF colour: white Package Contents: 12 x sublimation coasters Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.