Brand : PFU Model Number : PD-KB400KTBN Size : Packing size 37.3 x 16.1 x 5.6 cm Weight : 390 g Description : It is an option product compatible with HHKB Professional series (Professional: 4 products, Professional 2: 4 products, Professional 2 Type-S: 2 products). A set of key tops for exchange of English sequence model 60 pieces (Individual key only for specific key will not be sold separately) Please use it to replace the key top which was damaged or dirty for many years of use. For the purpose of mastering touch typing, you can also exchange the key top of the standard model (with engraved marks) to the key top without a stamp.