These 2-hole brick shaped beads are part of the Czechmates 2-hole beading system with the holes perfectly aligning with those of other 2-hole Czech beads. These beads are made 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. Brick beads measure 3mm x 6mm x3mm and have two parallel holes each measuring 1.25mm in diameter. Sold per strand of 50 beads