Complete beginner to mahjong. Picked up this set for $3 but

Complete beginner to mahjong. Picked up this set for $3 but noticed it's missing one piece. Can anyone tell me the name of it and where/how I can get a replacement?

Professional Chinese Mahjong Game Set 146 Numbered Melamine Large Size Tiles (Green) with Carrying Travel Case, English Instraction, Complete Mahjong Set (Majiang, Mah-Jongg, Maj Jongg, Ma Jong)

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Classic Chinese Mah Jonng Set with 146 cream white melamine tiles, 3 ivory dice, a wind indicator, color coded chips, and 1 easy to follow English

Chinese Numbered X-Large Tiles Mahjong Set. 144 Tiles 1.5 Easy-To-Read Game set / Complete set weighs 13 pounds. Gift / Birthday (Mah-Jongg, Mah

Chinese Numbered Tiles Mahjong Set. X-Large 144 Tiles Easy-To-Read Game set / Complete set weighs 13 pounds. Gift / Birthday (Mah-Jongg, Mah Jongg, Majiang)

Professional Chinese Mahjong Game Set 146 Numbered Melamine Large Size Tiles (Green) with Carrying Travel Case, English Instraction, Complete Mahjong Set (Majiang, Mah-Jongg, Maj Jongg, Ma Jong)

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Classic Chinese Mah Jonng Set with 146 cream white melamine tiles, 3 ivory dice, a wind indicator, color coded chips, and 1 easy to follow English

Chinese Numbered X-Large Tiles Mahjong Set. 144 Tiles 1.5 Easy-To-Read Game set / Complete set weighs 13 pounds. Gift / Birthday (Mah-Jongg, Mah

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