Evans Tri-Center Extended Collar Conga Drum Head, 11.00 Inch 11" extended collar drum head with two plies of 10mil film with a 2.25" patch between Bright, penetrating slap tone with a full, round low-end Etched texture simulates the feel of animal skin while avoiding the problems associated with natural skin heads Tri-Center minimizes overtones and adds weight to the center to enhance the fundamental tone Extended collar design fits congas with larger hoops including LP Giovanni and Extended Hoop models