10 mm Letters & Charms We carry only high quality Alphabet Letters, Charms, for all of our Personalized items.  All letters and charms are high quality austrian and/or czech crystals and all jewelry quality finishes.  All are lead free with quality finishes to protect the shine.  All letters and charms are 10mm sliders and fit most of our Personalized items that we carry.  We cannot be responsible if other 10mm letters or charms that you purchase elsewhere do not fit our products, or if our 10mm letters or charms will not fit other products that you have not purchased elsewhere.