Mechanism

Two bands. One window. A strip you can replace.

The cheap version is a single printed ring with grit paper glued around it. The version I want to sell next is a pair that snaps together: the inner ring carries the grit or a slogan; the outer ring has a cut-out and spins freely over it.

Drag to spin the outer band

Insert

The inner band stays on your finger. The outer band is the one that spins. Pause the window on a fresh patch of grit when the old one goes smooth — or hide it toward your palm when you want a plain band.

Inner

Sits on the finger

Bendable printed band, or later a sized metal shank. The outside is either a wrap land or a shallow channel. Grit paper, a slogan, or a name wraps or snaps into that channel.

Outer

Snaps on and spins

A rigid band with a 120–160° window. Inward lips click over the inner rims and then leave enough clearance that the outer band rotates without falling off.

Window

What you use, and what you show

Park it on a fresh grit face to file. Park it on a line you want to keep reading. Rotate it toward the palm when you want the ring to look like a plain band.

Assembled ring showing the slogan Simple Equals Success through the window — A slogan insert. Same geometry as grit — only the wrap changes.

CAD of a solid printed band next to a windowed outer band — Early print. Left is the inner / starter. Right is a windowed outer with extra cut-outs I later simplified.

Ready to hold a size?

Starter ships first. Signature follows once the snap is something I would mail to a stranger.

Go to the drop