Review title is Prompt Response [SEP] The first time buy the 30gx25mm threads and they were easy to use and perfect for beginners. The company gifted me a 5 pack of 29x38mm PDO which I thought was very good. My second purchase was 29gx38 screwed thread. The company however send me the wrong ones 30gx25mm PDO. I emailed them and their responses was almost immediate. They promised to send me the correct ones as a replacement..Will post another review if and when I get the replacements..