A craps bet that a number rolls before a 7, paid at true odds.
Like a Place bet it goes on 4, 5, 6, 8, 9 or 10, but it pays true odds (2 to 1 on the 4 and 10) and charges a commission (the vig, 5% of the bet). Example. Buy the 4 for 20 and if the 4 comes first you win 40 and pay 1 in commission. At a table that takes the vig only on wins, the house edge on buying the 4 or 10 is about 1.67%, smaller than the Place bet (9 to 5, about 6.67%).