These beads are made in the Czech Republic from pressed glass and have a very uniform size and shape. The corners are softly rounded and will not cut into your skin or thread. These 2-hole tile shaped beads are part of the Czechmates 2-hole system, with the holes perfectly aligning with those of the other 2-hole Czech beads. Czechmates Tiles are more durable and have 2x larger holes than Tile beads, allowing for multiple passes of beading threads. These beads measure 6mm x 6mm and have two parallel holes each measuring 1.25mm in diameter. Each strand has 50 brick beads.