I usually use T3 - 6 M of Max purchased at this site, but since I lost it I bought this product for the time being and tried using it. To buckle and not strike anything is to have any needle, but there were several times that it broke at the shoulder part. I used to use it for a while, but I gradually became irritated and ran to buy T3 - 6 M in my neighbor 's home center. Although the thickness is almost the same, it seems that such problems arise because there are problems in material or processing? Not limited to this product, I would like Monotaro to do a comparative test of products like "Life Handbook". I think that there are many users who wish not only to sell goods but also to present the judgment standards of the user side.