diff --git a/composables/useCalc.ts b/composables/useCalc.ts
index 214937f..c8badf7 100644
--- a/composables/useCalc.ts
+++ b/composables/useCalc.ts
@@ -5,12 +5,13 @@ export const predefLamelleColors = ['3009', '9003', '6027', '5024', '9001', '101
 
 const n = 2
 const min = 1300
+const random_pair = Math.floor(Math.random() * predefPillarColors.length)
 export const use_lamelle_height = () => useState<number>('lamelle_height', () => 0.115)
 export const use_lamelles_count = () => useState('lamelles_count', () => 14)
 export const use_fence_section = () => useState<number>('fence_section', () => min * 0.001)
 export const use_remove_pillar = () => useState<boolean>('remove_pillar', () => false)
-export const use_pillar_color = () => useState<ralTypes>('pillar_color', () => predefPillarColors[Math.floor(Math.random() * predefPillarColors.length)] as ralTypes)
-export const use_lamelle_color = () => useState<ralTypes>('lamelle_color', () => predefLamelleColors[Math.floor(Math.random() * predefLamelleColors.length)] as ralTypes)
+export const use_pillar_color = () => useState<ralTypes>('pillar_color', () => predefPillarColors[random_pair] as ralTypes)
+export const use_lamelle_color = () => useState<ralTypes>('lamelle_color', () => predefLamelleColors[random_pair] as ralTypes)
 export const use_section_count = () => useState('section_count', () => n)
 export const use_extra_section = () => useState('extra_section', () => 0)
 export const use_total_length = () => useState('total_length', () => (((min + 104) * n) + 104) * 0.001)