Specifications:Transmittance: >99.8%Material: Fused SilicaLaser Lens Power: 0-4KWSize: D27.9 x 4.1mmProtective Lens - White (D27.9 x 4.1)SKU: 182Quantity*Add to CartRETURN & REFUND POLICYNon-Refundable SHIPPING INFO2-3 Days for Available stock Items 7-14 Days for Out of Stock Items