CREE XB 16.0mm star. For Cree XB leds. XB-H, XB-D, XB-E, XB-G. White silkscreen ring is 10mm.

Each via should be filled with solder or, even better, a short piece of solid copper wire + solder.

Be aware oshpark pcbs are FR4 (flame retardant fiberglass), far from ideal for high power leds like XB-H. Led stars are normally MCPCB (metal core pcb). Only order this board if you can’t locate a proper MCPCB Cree XB star.