Biface hand axe and bifacial lithic items are distinguished. Lithic Cores may be multidirectional, conical, cylindrical, biconical, or bifacial. The progymnosperms were the first plants to develop true wood, grown from a bifacial cambium. They used classic bifacial projectile point technology. Tools included end-scrapers, perforators, axes, bifacial sickles and concave-base arrowheads. Bifacial chopper or chopping-tools were also excavated. Other names for the vascular cambium are the main cambium, wood cambium, or bifacial cambium. At Swan Point, these comprise micoblades, burins, and flakes struck from bifacial tools. All obsidian bifacial thinning flakes were found in a royal or elite context. Egyptian stone tools, while still in use, moved from bifacial construction to ripple-flaked construction. Bifacial fluting describes blades on which this feature appears on both its sides. The Clovis point is bifacial and typically fluted on both sides.