The OB1 model is a combination of a large i13 knob with a 271 barrel. Incredibly high density bat for more POP! This model can comfortably be used by contact or power hitters alike with its slightly end loaded swing weight. The Select bats come in birch or maple and in 6 color choices. They are available in 31"-34" (-3) with 5 models (Li89, DT71, KB17-3 HOS35 and YP66) available in smaller 26"-30" sizes. For full option choices see our Design Your Own Bat. SPECIFICATIONS: This bat comes with our medium flared 2" knob, 2 7/16" barrel, and a 15/16" handle. Bats have cupped ends when necessary to create optimum balance & weight differential.Option Notes:Engraving: Name and number will be engraved as spelling appears. Engraved bats are non returnable. It is up to the discretion of DTB to refuse to engrave inappropriate language or phrases. No professional teams or colleges will be engraved due to trademark rules without written consent. Cupping: No cup option will be accurate within +-.5