... your fingers and a wig pick and very gently, If knots have accumulated at the ends a straight or ... ,glue,etc.For refund or exchange,the customer need to bear the back and forth shipping fee.If the good is ... will be afforded by customer.2) Custom units:If the error of fault is caused by us,please ... after you have received it.If out of 3 days ,we donot accept return.Except this,our custom units normally ...