The neon knocker balls come in counts of 12 that are each 3.5″ in length and 3.5″ wide. The neon knocker balls are perfect for party favors, prizes or just for fun. Take to sport games to express pride in your team. Each piece is a bright neon color. These knocker balls are made of a quality plastic. For anyone 3 years of age and older. Includes 12 neon knockers in pink, yellow, green, and orange.