4mm round, solid beads, made of stainless surgical steel.
Sold per pkg of 50 beads.

Nickel safe

Solid beads are heavier that hollow ones, but they also have smoother holes with the same diameter all the way through bead: 1,3mm. If you'd rather choose hollow beads, you may like these.

Surgical steel is highly tarnish resistant and a great alternative to sterling silver. If you need jewelry findings that last and does not cost too much, surgical steel is a great choice.