Professor's Letter
BREAKthrough · #146 · Uncommon · Mid-era · 2015
Pulling Professor's Letter in a BREAKthrough pack is about 100% (Uncommon slot). Published, provably-fair odds you can verify.
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Professor's Letter market value
Professor's Letter (BREAKthrough #146) has a live market value of 31 Sparks, about $0.31 at the latest market price. That market price for Professor's Letter was last updated on October 19, 2026. On PackLab one Spark equals one cent of card value, so 31 Sparks is the figure shown for Professor's Letter in the set browser, on this page and in your vault after you pull it. If you pull Professor's Letter, you can sell it back instantly at 85% of market value, which comes to 26 Sparks at the current price. Sparks have no cash value and are only used on PackLab. A BREAKthrough pack is 3,200 Sparks; this card's market value is 31 Sparks. Among the 164 priced cards in BREAKthrough, Professor's Letter is the 98th most valuable. The median priced card in the set is 37 Sparks, and the most valuable card is Mewtwo-EX at 20,815 Sparks.
How to pull Professor's Letter
In a BREAKthrough pack, the Uncommon slot shows an Uncommon card about 100% of the time. Professor's Letter is one of 48 priced Uncommon cards in BREAKthrough that can fill that result, so landing this exact card is less likely than the rarity figure. These are the published odds for BREAKthrough: the full slot-by-slot table is on the BREAKthrough page, and the odds page explains how each set's rates are built. Every BREAKthrough box commits its card order before the first pack is sold, so each rip can be checked once the box sells out.
Rarity and era
Professor's Letter is an Uncommon card, number 146 in BREAKthrough. BREAKthrough lists 49 Uncommon cards out of 165 cards in total, about 30% of the set list. Among the 48 priced Uncommon cards, market values run from 15 Sparks to 855 Sparks, and Professor's Letter ranks 26th of them. BREAKthrough is part of the XY series and sits in the Mid-era era of the PackLab catalog. Mid-era sets sit between the early classics and the current releases, and sealed packs from them are harder to find today.
About BREAKthrough
BREAKthrough was released on November 4, 2015 and lists 165 cards on PackLab, 164 of them with a live market price. Together, the priced cards in BREAKthrough carry a combined market value of 140,014 Sparks. By market value, Professor's Letter sits just below Skyla (32 Sparks) and just above Starmie (31 Sparks).
