1. oval ball shape, which is covered with jam, it tastes sour. 2.The chemical viscosity of bubble gum is higher than ordinary chewing gum, so that the bubble will not break at once. 3.Many modern chewing gum brands are specially made for blowing bubbles, which is highly viscous but not easy to stick to the skin or clothing. The characteristics of bubble gum： (1) Bubble gum has a bodybuilding effect. (2) It can promote digestion. (3) The mouth can be cleaned.