Hello all, I recently purchased a mixer http://www.musiciansfriend.com/product/Kustom-KPM7250T-200W-7Channel-Powered-Mixer?sku=630545 used and I'm now in the process of trying to find some speakers for this baby.

Now the mixer has 200 watt capability and I found some speakers, same brand on sale for 80 bucks each http://www.musiciansfriend.com/product/Kustom-KPC15-15-PA-Speaker-Cabinet-with-Horn?sku=600816

They have 125 watt rms handling and 250 watt peak

Would these speakers work? what is rms handling and what is peak?

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Those speakers, having owned some myself, are rather craptastic. Save up and pay for quality cabs, expect to pay more than $100 per cab.

What are you using the PA for?

RMS handling is the constant stream of power the speaker can handle, peak is how much it can handle in a peak, or spike. Usually you wan't a mixer that delivers twice the RMS/constant wattage the cab can take, so you can peak the speaker without clipping the power amp, always delivering a pure sound to your speakers distortion threshold.