Jim Dunlop Gels are molded of unique custom formulated polycarbonate composition that provides superior tone, playability, and wear. The Gels" engineered tip and beveled edges combine for a superior positive attack and an excellent smooth string release. Each gauge in the pack is a hip translucent color. Choose Kiss the Sky Blue/light, Electric Lady Lime/medium light, Purple Haze/medium, Red House Red/heavy or Woodstock Yellow/extra heavy.