Spinning Base - Black Walnut Wood with Glass Concave Lens

Black Walnut Wood Spinning Base with 100mm (approx 4") Fused Silica Glass Concave Lens Precision Machined Made of natural Black Walnut. Durable, water-resistant. The gold standard of wood for a gold standard spin base Your Longest Spins Double concave lens so you can use both sides. Polished to a smooth slick finish to increase your Spin Times Hobbyist’s Delight Know a spin top hobbyist? Our spin station promises to make a special someone smile and spin for years Features: Fused Silica glassBlack Walnut wood3M non-slip rubberized feet Black Walnut Base:4.75 x 4.75 x .75 inchesWeight: 4.3 ounces Spinning Glass:Diameter - 100mm/10cm (3.93 in)Thickness - 10mm (0.4 in)Weight - 168 g (6 ounces)Radius of Curvature - 875mm - center of lens is 2.8mm thinner than the edges Recommended for ages 16+