Hello Baseball Fans,
At Baseball Almanac I am often asked questions pertaining to the construction of a modern baseball.
In 1999 Rawlings Sporting Goods wrote a very good - but tiny - article called Inside The Ball for syndication via the Associated Press. With that article was an image done by Rawlings that I believe was great. I saved the image and believe sharing it here will be interesting to many fans.
Note: Some cosmetic changes have been made to the image.
Now here are some answers to common questions that also come up:
Size: Between 9 - 9 1/4 inches.
Weight: Between 5 - 5 1/4 ounces.
And here are some trivia items that I have on file:
Construction Materials (working from the inside out):
Cork Center: 1/2 ounce and 2.86 to 2.94 inches.
Black & Red Rubber Layers: 7/8ths of an ounce each.
4-ply grey wool: 121 yards (brings weight up to 2 7/8 ounces).
3-ply white wool: 45 yards (brings circumference up to 8 3/4 inches).
3-ply grey wool: 53 yards (brings weight to 3 11/16 ounces and circumference to 8 7/8 inches).
Cotton yarn: 150 yards (brings weight to 4 5/8 ounces).
Those materials are put together using a high tension sewing machine then its all sealed with a coat of rubber cement. The cow-hide (horse-hide was used until 1974) is then sewn on using 108 (or 216 depending on the source & how you choose to count a "stitch") stitches from red cotton.
The modern baseball is then born. There are thousands of trivia items, historical items, and interesting items not addressed here in this brief look at a modern ball. If you are interested in those other similar topics, please post a message in the appropriate forum.