how do you know which metal is which

If you go to the picture on the website they are labeled. The oranger colored one is Copper while the golden one is Brass. The brightest and lightest one is Aluminum. the darkest and heaviest one is Lead. The you have left zinc and iron which are very similar in color, but iron is slightly heavier and the zinc has a slight brown gray to the silver color.

Are the edges beveled or sharp when you receive them

The edges are as seen in the photograph. Not necessarily sharp, but not beveled either.

Want to use them as feet for 12”x12” granite remnant Will this work?

They are solid metal and teeny. So they most likely wouldn't be noticed underneath, but given the weight of granite I would think you would need two sets with probably 3 per side and the remaining maybe as 4 corners of a square in the middle so it doesn't buckle or crack over time especially if something comes down on it hard. The silver colored ones are similar enough to look the same if you put on the outside while putting the brass and copper on the inside. Assuming the 12x12 remnant is laying parallel to a surface like a cutting board.

Could we use this fir a water experiment? To test for metals in water

These are designed for density and specific gravity experiments. They aren't designed for testing for metal in water.

Eisco Density Cubes Set Metal Cubes For Science Density Kit

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Description

⚗️ Unlock the power of metals—because mastering density never looked this sleek!

COMPACT CONSISTENT - Each cube measures a uniform 10mm (0.4”) side, ensuring reliable and repeatable density experiments every time.
ORGANIZED PORTABLE - Snap-top plastic case keeps your density set neatly stored and travel-ready for on-the-go learning or demos.
TRUSTED BY EDUCATORS - Highly rated and perfect for physical science classrooms, from middle school to high school, making complex concepts tangible.
STEM READY WITH GUIDANCE - Comes with a detailed experiment manual featuring metal properties and student activities to elevate classroom engagement.
MASTER DENSITY LIKE A PRO - Six precision-stamped metal cubes—Brass, Lead, Iron, Copper, Aluminum, Zinc—ready for hands-on STEM exploration.

The EISCO Density Cubes Set includes six 10mm metal cubes—Brass, Lead, Iron, Copper, Aluminum, and Zinc—each stamped for easy identification. Designed for STEM education, this set supports density, specific gravity, and specific heat experiments. It comes with a convenient storage case and a comprehensive manual with background info and student activities, making it an essential hands-on tool for physical science classrooms.

Specifications

ASIN	B0108XKPNK
Best Sellers Rank	#79,916 in Toys & Games ( See Top 100 in Toys & Games ) #673 in Educational Science Kits
Brand Name	EISCO
Customer Reviews	4.1 4.1 out of 5 stars (230)
Educational Objective	STEM
Global Trade Identification Number	00849230036522
Item Dimensions	6 x 4 x 4 inches
Item Highlight	Brass, Lead, Iron, Copper, Aluminum & Zinc, Manual with Questions, Stamped IDs, Mass & Density for Classroom, Snap-Top Case
Item Weight	0.05 kg
Manufacturer	Eisco
Manufacturer Part Number	PH0106
Material Type	Metal
Model Number	PH0106
Number of Items	1
Set Name	EISCO Density Cubes Set (6 Piece)
Size	10mm (0.4")
Theme	Physics
UPC	849230036522
Unit Count	6 Count

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