Wegen Picks Gypsy Jazz GP250 2.5 mm - White 1 pickGauges : 2.5 mm.Size 30 mm long x 26 mm wideThe material I use is sounding very close to tortoise , but it is lasting much longer. The pick has a nice beveled and curved tip, so it makes a difference if you're right- or left-handed. Both sides have grooves for grip, and the thumb side is concaved with grooves.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.