Our musical owl guiro rasp train whistles currently come in 1 size . The 4 inch owls make an amazingly realistic sound when blown slowly in the slit in the back of their necks. Each owl is handmade, hand finished with linseed oil and hand carved by hammer and chisel from a solid block of monkey pod wood by our Thai artisan partners. Each owl will vary in size, shape, color and sound. No two are exactly alike! This product is made from consciously sourced sustainable materials and is eco-friendly and fairly traded. Approximate dimensions and weights: Size – 4 = L 2.5″ x W 2.25″ x H 4″ @ 4.5oz Size – 4 = 6.4 cm x 5.7 cm x 10cm @ 127 gr