Futaba GY520 Gyro w/Heading Hold

http://www.futaba-rc.com The GY520 may well be the best heading hold gyro ever made. It’s definitely the smallest lightest. It measures just 0.79 x 0.79 x 0.39 inches and at just ten grams (about 1/3 of an ounce), it’s six grams (or 1/5 of an ounce) lighter than anything else out there.