High-Quality Materials: These anatomical brain coasters come in a set of ten. Fun coaster sets made from acrylic, resistant to high and low temperatures, strong, and durable. Beautifully patterned, each coaster is coated with a sealant to prevent the decal from rubbing off. Non-Slip: Our brain slice coasters feature four rubber feet on the bottom to prevent slipping. They stabilize your cup and protect your table from scratches. Enjoying a hot beverage won't leave marks on your table, and placing a cup on the table makes very little noise. Easy to Clean and Store: Hand wash only; you can also use a cloth to gently wipe them. Do not place in the microwave. The drink coasters are fun and measure 4 inches, accommodating various mug sizes. Interesting Organ Design: Stacked in label order, you can see a 3D brain, which is fun and space-saving. Meaningful Neuroscience Gift: These medical coasters make a very meaningful thank-you gift for doctors, nurses, medical students, and healthcare professionals. These unique coasters also serve as special decorations for offices or coffee tables. They are perfect as medical school graduation gifts or quirky gifts.