Ultra hard, long lasting Every guitarist should never be without a plectrum and the Jim Dunlop Delrin 500 guitar plectrums are crafted to work hard for you. The ultra-hard plastic offers exceptional grip and improved 'memory'. What this means for you is that the Dunlop Delrin 500 plectrum won't warp over time offering a greater life expectancy. And for those times where loss or damage can't be avoided, you have the comfort of knowing that you can simply get another out from the multi-pack. The Jim Dunlop Delrin 500 guitar plectrum, crafted to work in harmony with your playing style and will not let you down.