[Home](./index.md) > [server](./server.md) > [ParticleEmitterOptions](./server.particleemitteroptions.md) > [sizeStartVariance](./server.particleemitteroptions.sizestartvariance.md) ## ParticleEmitterOptions.sizeStartVariance property The size variance at the start of an emitted particle's lifetime. **Signature:** ```typescript sizeStartVariance?: number; ```