Pins
USBC rules specify that a pin must be 15 inches (38.1 cm) tall and about 4.7 inches (11.4 cm) wide at the "belly" of the pin, where a rolling ball would make contact. There are additional measurements which delineate the shape. The weight of a single pin must be at least 3 pounds, 4 ounces (1.47 kg) and no more than 3 pounds, 10 ounces (1.64 kg). Within a set of ten pins, the individual weights may vary by no more than 4 ounces (113.4 g), if made from wood or plastic coated, or just 2 ounces (56.7 g) if synthetic.
The top of the pin shall have a uniform arc with a radius of 1.273 inches, plus/minus 1/32 inch (31.5 – 33 mm).
The pins must show the name and mark of the maker, either "USBC Approved", "WIBC Approved", or "BTBA Approved" and appear uniform.
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