AA900 Made of 100% PTFE material, Flexible Lantern Material is an innovative approach to standard lantern rings. Designed to perform like lantern rings, Flexible Lantern Material is easier to install and remove. Sold in roll form like bulk packing, Flexible Lantern Ring Material can be cut to the specific length needed, therefore eliminating the need to stock many different size rings. The Lantern Ring is simple to use. Just uncoil the length, wrap it around the pump shaft, and butt cut to size. The ring will spring to the bore of the stuffing box, providing shaft clearance. For perfect end joint fit, wrap two turns of electrical tape around a mandrel of the same size as the pump shaft and butt cut. Size Selection: Choose the same size as the packing cross-section and choose the width which matches.