Colors represent the hardness of ball:
Orange:
Warm weather ball
Ideal play in 60 degrees or warmer weather
Fluorescent orange for high visibility
Most popular choice
Red:
Hot weather ball
Ideal play in 75 degerees or warmer weather
Keeps the play fast on those hot days
Pink:
Cool weather ball
Ideal for play in 30-60 degrees weather
Yellow:
Cold weather ball
Ideal for play in 30 degrees and below
*InlineWarehouse.com referenced 4/22/19