I bought
"TRUGLO Replacement Fiber Optic
100"x5.5" Multiple Colors."
Filamnts on Amazon.
.100" diameter is needed on the JM Pro.
The pack comes with 3 red and 2 green fibres x 5.5 " long... more than you'll ever need. Was only $15.81.
Search Amazon for the string in quotes above.
.should come right up.
Search youtube for how to replace them... you have melt the ends with a soldering tip NEAR the ends of the filament.... not touching... go slow... be patient...keep the soldering tip about 1/8"away from the end and it will mushroom the end of the filament after about 3 to 5 minutes...