These multifunctional calling balls feature an open design that simplifies ticket insertion for various lottery and drawing applications. With a standard diameter of 1.57 inches, they are compatible with most lottery machines and manual draw scenarios. Crafted from durable polypropylene material, these hollow balls offer both lightweight handling and structural durability. The multicolor selection provides visual appeal and allows for easy differentiation between prize levels or categories during events. Size Chart: diameter : 4cm/1.57inch Package Includes: 45-50 Bingo Balls (5 Random Colors) 95-100 Bingo Balls (5 Random Colors) Note: Please allow slightly errors due to manual measurement and different monitors.