I'll probably regret this, but I'm using mostly a reflector these days, so out they go.
These four 1.25" LRGB filters are rare and no longer sold or manufactured by Hutech/IDAS, and I've never seen them before on Astromart. They were designed specifically for refractors by cutting off UV to completely eliminate blue haloes, and I am not aware of any other set that is designed for refractors that works as well. In new condition. $200 plus actual shipping. Paypal/Money Orders.