Other forks may exhibit up to ten tines. The pastry is folded over and then sealed with the tines of a fork. A rotary power harrow, or simply power harrow, has multiple sets of vertical tines. A traditional design, the grapnel is merely a shank with four or more tines. The antlers and brow tines are longer than those in the hog deer. The ends of the tines protrude slightly above the level of the casing. Tridents used in modern spear-fishing usually have barbed tines, which trap the speared fish firmly. Antler beam diameter, not the number of tines, indicates age. Similarly, the hyracoid toothcomb consists of incisors with multiple tines, called "pectinations". Lighter pressure produces less flexing of the tines, creating thinner strokes. The metal tines are grouped into multiple octaves. Nibs divided into three "tines" are commonly known as music nibs. This motion has to be resisted by electrostatic forces from the electrodes under the tines. Lamellophones are instruments which have little tines, or "lamellae", which are played by plucking. The tines are made from high-carbon spring steel.