Leisenring Spider (close but not perfect)
Hook - Mustad Model R70 / Size 10 (Size 12 work nice too)
Thread - Pearsall's Gosomer Silk (Chestnut Brown)
Hackle - Hungarian Partridge
Body - Leisenring Style Silk Dubbing Brush (created by twisting Red waxed silk with sparse amount of hares ear dubbing)