SP PBT caps are lower profile (height) than KBC PBT caps. They are very similar in thickness, the SP cap may be slightly thicker but I don't have a micrometer to verify.
KBC cap is black, SP is brown. Both caps are R4.
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Where do you find this brown SP PBT cap? I see the text on it, so is it dye-sub PBT? Have never seen any group buy on the brown dye-sub PBT.
Btw, I have a PBT dye-sub keyset from SP, and the texture on it gives me very nice feeling and may be as nice as the texture on topre's caps. The texture on KBC PB,T in some ways, feels like the SP ABS, rougher than SP PBT.