Tell me the bullet tip color of headstamp id of h1z
CREATE TABLE "headstamps_and_colour_coding" (
  "headstamp_id" text,
  "primer_annulus_color" text,
  "bullet_tip_color" text,
  "other_features" text,
  "functional_type" text
);
SELECT "bullet_tip_color" FROM "headstamps_and_colour_coding" WHERE "headstamp_id"='h1z';