Whoopie slings have a permanent eye splice at one end and an adjustable eye at the other end that allows it to adapt to loads of various sizes. The adjustment allows snug lifting control and minimizes the number of fixed length slings required.
Nylon slings when used with aerial blocks provide the arborist with the ideal false crotch for lowering limbs and trunk wood.
Spider lanyards are eye slings that when attached to a rigger's line create a balance to a targeted removal. With a lowering line, the operator is able to control the tip and base of the removed log. Using more than one spider lanyard allows the user to balance sprawling limbs without the need for excessive cutting.