Features:1) Solar auto-darkening welding helmets available 2) Shade no. 9 - 13 available 3) Two sizes: 4-1/4" x 2", 110 x 90mm (for shade no. 10 or 11) 4) Flip up helmets and hand-hold helmets available with various sizes of filters 5) Gold-plated or silver-plated welding filters also availableMD-0386 TECHNICAL SPECIFICATIONS Viewing Area:98 x 43 mm (3.86'' x 1.69'')Size of Cartridge:110 x 90 x 9 mm (4.33'' x 3.54'' x 0.35'')UV/IR Protection:Up To Shade DIN 16 at all timeLight State:Shade DIN 4Variable Shade:From DIN 9 (8) to DIN 13 (14)Power Supply:Solar cells, No battery change required.Power On/Off:Fully AutomaticSensitivity:Can be adjustable ( low or high )Switching Time: a) Light to Dark:1/25000 ( 0.04 ms) b) Dark to Light:0.250.35 s at "short" position0.50.8 s at "long" positionOperating Temperature:-5 to 55 (23 to 131)Storing Temperature:-20 to 70 (-4 to 158)Helmet Material:Polyamide ( Nylon) / High-impact resistant plasticTotal Weight:460g or 440gWe supply various kinds of flip up welding helmets in different sizes of welding filters. Solar Solar Auto-Darkening Welding Helmet (welding product, mask)