Dear Janeth,

Thank you for your inquiry. These pebbles are not flat. They are rounded. Within a matter of several day to 2 weeks, there will be an option to purchase a box of 10, a box of 5 or full sheet. This will allow you to purchase smaller quantity to do your project. Keep in mind, the product is interlocking and the sq.ft. for each sheet slightly less than a sq.ft. In other words, if you need 12 sq.ft. you will need a minimum of 13 pieces. Also, please consider a 10% waste factor which is typically needed for the your installation. Thank you again and I hope this was helpful.