**THIS UNIT DOES NOT REQUIRE ANY ADHESIVE GLUE.** RETURN POLICY AJCUSTOMWIGS believes in excellent customer service while making all unit with love and care. This unit is an average size of a 21"-22" circumference. Also, if you are looking for a specific color, please provide the exact color and/or name of the product. Unfortunately, ALL SALES ARE FINAL. Units cannot be returned for an exchange or refund. This policy is strictly upheld.