Sign up for an Award
Participate with your entry in one of our professional or student awards.
Sign up for an awardLearn more:
Unsupported browser
You are using an outdated browser. Please upgrade your browser to improve your experience.
People in the use of condoms will often try to distinguish the condom is negative, but this behavior is likely to result in the failure of contraception. So I designed a small bulge in condoms, when people use can touch to distinguish, help us to quickly correct condom use. To make our love a more safe and harmonious.
Yanshan University
Qinghuangdao, China
Cheng Yongsheng
Yan Bo