This stamp is 9.50 cm.
Lavinia Stamps are clear unmounted stamps.
We recommend stamping Lavinia stamps with Archival or Versafine Ink Pads.
To ensure your images are stamped crisp and solid try inking up your stamp several times and practice stamping on scrap paper.
Make sure you are stamping on a solid, even surface and try adding slight cushioning (i.e. several sheets of paper) under the surface you are stamping on.