From beckett.com "They were a test issue that looks exactly like the 1985 Topps standard-size counterparts, but measures a slightly smaller 2 3/8" by 3 9/32" and are printed on white OPC-like card stock. These cards were produced in extremely limited quantities and probably were supposed to be destroyed. Only one of the six 132-card sheets were produced in this fashion, thus none of the key Rookie Cards exist in mini form. It is estimated that 100 or less of each card exists. Approximately 2/3 of the cards were printed with the complete backs while the others are blank backed."
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They call me "Pack the Ripper"