Hollow copper ball, very light, approx 10 inches diameter, bought in South West England at a car boot sale (£5) : r/whatisthisthing

3-1/2in. Diameter Ball - 2 Piece - 1/8ips Slip Through Center Hole - U

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Copper Balls #CB - New England Copperworks, Inc.

Shepherd Hardware 9352 1-5/8-Inch Hooded Ball Stem Caster, Bright Brass, 2-Pack : Industrial & Scientific

Copper 1.125 Raw Round Discs, Circles 5-400 W/pvc Protection

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Advanced View of Atmega Microcontroller Projects List 1649 - ATMega32 AVR, PDF, Microcontroller

Copper Balls #CB - New England Copperworks, Inc.

2-pc. heavy cast, hollow brass ball, 4 diameter, slips 1/8IP center hole, Unfinished brass

4 Inch Hollow Brass Ball (11646U)

H&N Excite Spitzkugel Coppa 22 / 5 5mm Copper Pointed Pellets

Harry Harrison - Fifty Stories in Fifty Years - PDF Free Download

Custom Hemisphere Shape Hollow Copper Sphere Ball - China Hollow