uxcell 3/8-inch Bearing Balls Tungsten Carbide G25 Precision Balls

As advertised 3/8 tungsten ball. I inlet mine into 16 oz ball peen hammer to peen hardened steel. It works great.

This Carbide Ball is working great with the ball peen hammer for straightening knife warps and bends

Correct size I needed for the face of a ball peen hammer modification to use for straightening mild warps in forged knife blades.

A rhetorical question for sure. They appear to be round, they measure 3/8" diameter and (as far as I can tell) are made of tungsten carbide . I don't know what G25 means so I can't comment on that. I used them in some experiments regarding Brinell Hardness testing. I have loaded them up with 3000 lbs force which they survived without apparent damage. Yes, I know Brinell hardness tests are generally done with 11mm balls but other diameters can be used since Brinell hardness is the surface pressure on the created dent. All you need to do is adjust the calculations to reflect the diameter of the ball being used.

Worked great making a straightening hammer.

I disliked they are a bit smaller than advertised. If being exact size is what you're looking for then this isn't it.

For the price very good quality! I used it to silver solder on the round portion of a ball peen hammer. One of many ways to straighten knives after quenching them to make them hard.