Flat round and oval shell beads are made of Philippine natural sea shells and available in two finishes: side-drilled and top-holed. Flat shell bead strands are made of two shell pieces put together and drilled through the side. Round shell pieces come with 2mm holes near the top-edge. Design Tip: Top-holed shell coin beads work great as charms. Side-drilled flat shell beads are perfect for drop earrings design or strung necklaces and bracelets.