Serinity hotfix crystals Square (2400) Crystal AB are flat back crystals where the reverse side of the crystal has been pre-coated with a heat-sensitive glue. Serinity Square shaped crystals are a type of crystal that features a four-sided square shape with a flat top and simple bevelled edges. The shape's faceting is specifically designed to reflect and refract light, with the slight bevel adding a touch of softness to the overall appearance.

Crystal AB is a colourless, transparent crystal bead that has a special coating that reflects light in a rainbow of colours, hence the name AB which stands for Aurora Borealis. It is a popular colour in the world of jewellery making and beading, as it adds a touch of sparkle and glamour to any design.