The association and its members may make and execute marketing contracts, requiring the members to sell, for any period of time, not over ten years, all or any specified part of their agricultural products or specified commodities exclusively to or through the association or any facilities to be created by the association. If they contract a sale to the association, it shall be conclusively held that title to the products passes absolutely and unreservedly, except recorded liens, to the association upon delivery, or at any other specified time if expressly and definitely agreed in the said contract. The contract may provide, among other things, that the association may sell or resell the products delivered by its members, with or without taking title thereto; and pay over to its members the resale price, after deducting all necessary selling, overhead and other costs and expenses, including interest, not exceeding eight percent per annum, or any other proper deductions.