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Call them what you like, ducks or whales or simply drafting weights.
They're quite utilitarian... nothing fancy--just your basic finish and an exceptional price--and ideal for your drafting/lofting floor work. And yes, ideal for keeping your papers together when your pals throw open the office windows. They weigh-in at approximately 4-1/2 lbs, and are made of Ductile (60-45-10) Iron.
Wires are 1/8" solid brass rod, with 6-32 threads. Please note: you can bend/shorten, etc., the brass rod*, but we suggest you not do that whilst it's in the weight.
Maine made.
The 60-45-10 is a stress rating of tension, tension yield point, and enlongation.
* 360 brass, which is Cu (copper) 60-63, Pb (lead) 2.5-3.7, Fe (iron) .35, and Zn (zinc) for the balance
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