How to create a rule for specific products?

1) You can use the SKU. If this option is not available open Catalog > Attributes > Manage Attributes > SKU, set property "Use for Promo Rule Conditions" to "Yes", refresh indexes (System > Index Management).

create a rule for specific product

2) Another option is to create a hidden category, add a product to this category and specify the category as the condition.

See more details on Special Promotions page
Rate the answer?