Lurking in Hidalgo street is a photographer distributing "Strobist Fliters" set to photo stalls there with a Php 350 price tag-which I came to realize was a bargain! The set totaled 16 pieces of sundry filters measuring 14cm x 4cm. Allow moi to itemized them for you in random order:
101 YELLOW
205 12 CTO
246 1/4 PLUS GREEN
206 1/4 CTO
244 PLUS GREEN
182 LIGHT RED
203 1/4 CTB
201 CTB
63 PALE BLUE
209 0.3 ND (1 STOP)
124 DARK GREEN
113 MAGENTA
128 BRIGHT PINK
210 0.6 ND (2 STOPS)
204 CTO
202 1/2 CTB
Because the 14cm length was made to accommodate velcro at both ends (to adhere to the flash head), I found my SB900's filter holder adequate (photo below). For my hammer units, yours truly just clipped the length to 8.3cm-which just slides into the Sunpak's holder. This set is cheaper than buying individual pre-cut sheets. Kudos to that mysterious Pentaxian supplier (whoever he is)! Buy them quickly as stocks seem to be erratic in supply.