They're probably refering to "Wonder Wads". These are a felt wad made in the various calibres and are impregnated with a dry lube. After pouring the powder charge, the wonder wad is seated on top of the powder, and then the ball is seated firmly over the wad. The wad under the bullet serves as bith a gas seal, and a lube. Some shooters who use the wads still put a layer of grease over the bullet to increase the amount of lube. The negatives of a wonder wad are that it adds an additional expense to each round, and it uses up chamber space that would otherwise be additional powder space. On the plus side, when used alone, the wad provides both a seal and a lube without the messiness of grease, and unlike grease, the wad does not melt when preceeding chambers are fired. Most suppliers sell wonder wads. You can do a google search for wonder wads...... Regards.