yea. they meant the weight. but like a well-machined crankshaft, there are always tolerances. It is usually hard to get balls at exactly the same weight. There will always be some plus, minus. To get the exact weight, use the weight balance in the proshop.
www.brunswickbowling.com
www.columbia300.com (techdocs)
www.ebonite.com
to read abt user comments on types of balls:
www.bowlingballreviews.com
www.ballreviews.com
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