Dunlop Primetone 307 3.00mm. Jazz/Gypsy Picks Accuracy and tone are two key elements we took into consideration when designing our JD Jazztones. Developed specifically for the jazz guitarist, JD Jazztones feature a super gripping surface, are non-flexible, great for speed, and have a precision contoured edge to ensure a smooth release. Great for jazz & gypsy jazz. Bright and durable polycarbonate. Carved gripping surface. Available in 3mm and 5mm.