Owen Lowe writes:
Actually for T-Ball it would probably work out A-OK since the balls
are soft rubber.

I've found that pine yields a bat that's the correct weight for the
size for T-ball bats (15oz) but it doesn't last long if (when) the
kids leave the bat outdoors in the rain.

The first bat was oak (that's what I had in the tree pile) and it was
WAY too heavy for the kids, but boy did it send the ball!