The GTO was designed as a wide-appeal middle-of-the-road option for those wanting to try Dif-E-Yo's line. It measures 1.400" wide and 2.125" in diameter. It weighs 62 grams without the weight rings and 69.5 grams with them. It includes the Dif-Pad response system and the KonKave bearing which keeps the string centered on the axle because of its concave shape (hence the name). All this adds up to making the GTO extremely smooth with long spin times and makes it great for multi-layer string tricks. The "F" suffix in "GTO - F" means that this is a revised model, with flush-mounted Dif-Pads that keep the response level high while ensuring the longest spin possible, even with multiple layers of string.