Wegen Picks Bluegrass 1.0 mm - Black1 pickGauges : 1.0 mm.These are the ultimate picks for serious bluegrass guitarists. After all, I only want to offer the best money can buy. My material just sounds great for bluegrass at a 1.4 mm thickness. We are continuously evaluating on grip and design, to improve the picks even further. Absolutely very nice ideas are coming up.