DFP250 is ideal for articulation on xylophones, upper range marimbas, and auxiliary percussion instruments such as woodblocks.. Length: 16 27/64" Head Size: 1.125 x 1.125". Designed specifically for usage in the classroom, these mallets are designed to be durable while also budget friendly. features a 1 1/8" hard rubber head on a birch shaft. All Promark drumsticks are designed and manufactured in the USA to the most stringent quality controls in the industry. .