Traditionally made from leftover glass by glass blowers and given to friends and family as tokens of good luck and friendship. Just like our friends each Kugel is unique. Bright opaque and transparent glass colors are swirled into the clear glass to make the design. Mirrored crackle Kugels have a small hole (pontil hole) in the bottom where the silver was poured inside.. Color, patterns and saturation will vary as each piece is hand crafted.