Doctors, what are vcf spermicide strips?

Here are some ...: It is another gadget for contraception, which is prepared as film made of gel and spermicide, and manually inserted to near cervix some 3-5 minutes before sex, where this film will swell to become gel with spermicide to block sperms into cervical canal and uterus. But its success is only some 94%, far behind condom at 98%. So, consider other more effective options ...