To increase batting power, I've weighted used size 3 softball softballs by wrapping them with masking tape and vinyl tape. They are divided into white and yellow. The color coding is for practice: white for hitting, yellow for taking pitches, etc. The vinyl tape has been freshly re-wrapped. Recommended for those who want to build power and practice tee-batting in a game-like setting. There are 12 yellow balls and 12 white balls.