Before getting a brass mod,read this:
https://en.wikipedia.org/wiki/Brass
Material Name: Brass Alloys
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In case of inadequate ventilation wear respiratory
protection
Contaminated work clothing should not be allowed out of the workplace.
Wash thoroughly after handling
Wear protective gloves
Obtain special instructions before use
Do not handle until all safety precautions have been read and understood
Use pers
onal protective equipment as required
Do not eat, drink or smoke when using this product.
Avoid release to the environment
Personal Protective Equipment: Hands
Use impervious gloves such as neoprene, nitrile, or rubber for hand protection.
http://www.ryerson.com/en/Products/Metals/~/media/www/Files/MSDS Files/MSDS Brass Alloys.ashx
http://www.onlinemetals.com/brassguide.cfm
360 Brass (Free Machining Brass)
Free Machining brass is the most commonly used of the brass rod and bar items. The presence of lead in the alloy creates a highly machinable material that can easily be cut and shaped into whatever you need. It is not so good, however, at forming operations.
C360 Free Machining Brass
Minimum Properties Ultimate Tensile Strength, psi 58,000
Yield Strength, psi 45,000
Elongation 25%
Rockwell Hardness B78
Chemistry Copper (Cu) 60 - 63%
Zinc (Zn) 35.5%
Iron (Fe) 0.35% min
Lead (Pb) 2.5 - 3.7%