Abstract: A heat release type decalcomania for marking a tennis ball cover comprising a carrier sheet having on one surface thereof a clear film of thermosetting elastomer formed of a siliconized polyester composition and a blocked isocyanate composition which crosslink when heated at a temperature effecting release of the clear film from the carrier sheet and having on the clear film a composite design formed of a first color layer of a polyamide resin having a softening point of about 100.degree. F. (38.degree. C.) and a second color layer of a polyamide resin having a softening point of about 230.degree. F. (110.degree. C.) with both said layers having a low viscosity adapted to penetrate the tennis ball cover when the design is heated to a temperature at which said clear film is released from said carrier strip.