The Thingamabody is an incredibly buoyant and waterproof fly body. It is easy to tie traditional patterns with unbelievable color versatility and great looking color translucence. This fly body uses trapped air, making it virtually unsinkable. Size small specs: 18.2mm length, 6mm height, 3.5mm segment separator height, 0.65mm hook groove. Size medium specs: 22.5mm length, 7mm height, 4mm segment separator height, 0.80mm hook groove. Size large specs: 28mm length, 8.3mm height, 5mm segment separator height, 1mm hook groove. The possibilities are limitless!