Reasoning
After aggregating four sources, three identify 7-inch props (PyroDrone, Dronexl, RCHobbyLab) and one lists 7.5 (ProgressiveRC). Treating each URL/domain as a single opinion and weighting by confidence, the majority signal is 7 inches, with high-confidence entries supporting 7.5 appearing only in one source. Therefore the consensus value is 7.