where ??

Sounds more like a slin size.....I would be afraid I'd break off that small a needle size if I injected intramuscularly
 
a 28g would be a larger slin pin, most small slin pins are 30g. For an inter-muscle injection you will be fine with the 25g, with the 28g you are starting to get a pretty slim pin, and your chances at breaking it off in your muscle are greater.
 
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