The 1990 Skybox Prototype set contains 9 trading cards. Raw card prices range from $8.00 to $302.62. 9 of 9 cards have current market pricing.
Source: HobbyCardIndex · Prices updated daily · https://hobbycardindex.com/sets/skybox-prototype1990 Skybox Prototype
Basketball ·
9 cards in set
Total Cards
9
With Prices
9