Material. Rubber. Size. 2.75inch; Thickness. 0.15ich Advantage. Diy Sublimation Coasters Are Made of Neoprene with a Heat Transfer Layer & a Rubber Base. the Coloring Effect on the Pure White Surface is Very Good, & Clear Transparent Patterns & Bright Colors Can be Sublimated. the Non-slip Bottom Can Firmly Grasp the Desk Top & Prevent Slipping, & It is Not Easy to Slip When Bumping on the Road or Placed on a Smooth Desk Top. Sublimation Coasters Can be Designed in Your Own Style. After Print Beautiful & Festive Pictures, They Can be Used as Home Decorations or Gifts for Family & Friends on Birthdays, Thanksgiving, Mothers Day, Fathers Day, Christmas, Valentines Day & Other Occasions; They Can be Used in Cars, Kitchens, Bedrooms, Living Rooms, Offices, Cafes, Hotels,