This baseball 6 pack is the perfect option for toddlers and little kids. The baseball t-balls are made of lightweight plastic that is hollowed out on the inside for added safety. The generous 3.5? diameter of the t-ball baseball makes this oversized baseball easier for children to hit while they?re learning and helps them to develop motor skills. It is also sized to fit perfectly on popular toddler t-ball sets, including the Little Tikes T-Ball Set. These balls are an excellent replacement if you lose the balls that came with your t-ball set or you just need some additional balls to hit with.