The Leather Ring Supporter is a simple tool that reduces the impression on the leather caused by the binder ring. It also cushions and protects the rings from unintended impact. It is sturdy genuine leather with slight elasticity, so it is easy to set up and remove, specially designed for0.43 inch (11mm)diameter 5-hole rings. This Leather Ring Supporter is compatible with PLOTTER Leather Binders in Mini 5 Size Specifications Body / Steer (cowhide)Body size / H3.9\” W1.6\” (98mm X 40mm)Country of origin / Made in Japan WARNING: Californias Proposition 65