Starting in 1997 with Upper Deck, companies began inserting cards with swatches of uniforms and pieces of game-used baseball equipment as part of a plan to generate interest. Card companies obtained all manner of memorabilia, from uniform jerseys and pants, to bats, gloves, caps, and even bases and defunct stadium seats to feed this new hobby demand. It is also in 1997 that the first "one-of-one" cards were released by Fleer, beginning with the 1997 Flair Showcase "Masterpieces" (the Ultra set would begin to include purple 1-of-1 masterpieces the following year). Both kinds of inserts remain popular staples in the hobby today.